User Manual 455U-D Radio Modem ELPRO Technologies Pty Ltd, 9/12 Billabong Street, Stafford Q 4053, Australia. Tel: +61 7 33528600 Fax: +61 7 33528677 Email: sales@elprotech.com Web: www.elprotech.
455U-D Radio Modem Module User Manual Thank you for your selection of the 455U-D radio modem. We trust it will give you many years of valuable service. ATTENTION! Incorrect termination of supply wires may cause internal damage and will void warranty. To ensure your 455U-D enjoys a long life, double check ALL your connections with the user’s manual before turning the power on.
Contents How to Use This Manual To receive the maximum benefit from your 455U-D product, please read the Introduction, Installation and Configuration chapters of this manual thoroughly before putting the 455U-D to work. Chapter Four Specifications details the features of the product and lists the standards to which the product is approved. Chapter Five Troubleshooting will help if your system has problems and Chapter Seven specifies the Warranty and Service conditions.
55U-D Radio Modem Module User Manual CONTENTS WARNING ............................................................................................................................... 3 CHAPTER ONE 1.1 1.1.1 1.1.2 1.1.3 1.1.4 1.2 INTRODUCTION ..................................................................... 7 GENERAL ................................................................................................................. 7 Basic Operation ......................................................
Contents CHAPTER THREE CONFIGURATION........................................................................ 30 3.1 3.1.1 3.1.2 3.2 BEFORE CONFIGURING ........................................................................................... 30 Addressing ............................................................................................................... 30 Command Mode ......................................................................................................
455U-D Radio Modem Module 4.4.1 4.4.2 4.4.3 4.5 User Manual Bit Error Ratio Test (BER)...................................................................................... 56 Other Radio Testing - AT&Tx ................................................................................ 57 On-line diagnostics .................................................................................................. 58 RADIO PATH TESTING .................................................................................
Chapter One Introduction Chapter One INTRODUCTION 1.1 General The 455U-D radio modem provides reliable radio modem operation with advanced communication control and diagnostics functions. Radio modems transmit serial data over a long distance via radio. The serial data is not changed - the output data is the same as the input data. Although the 455U-D is intended to be simple in its application, it also provides many sophisticated features.
455U-D Radio Modem Module User Manual Ordering Information 455U - Type – Radio Type – RF Power – Channel – Band – Frequency 1.1.1 Type D B A C Data modem, full functionality Data modem, Bell 202 or V23 messaging External modem, 600 ohm audio input Data modem compatible with ELPRO 405U Radio Type L 10 – 500mW Power Actual power requested - for example, 100mW or 2W Channel N 12.
Chapter One 1.1.3 Introduction Repeater Functionality A 455U-D unit can act as a repeater for other units. A repeater receives a radio message from one unit and re-transmits it on to another unit. Up to seven repeater addresses can be configured in a radio link. If transmitting to the wildcard 0 address in Unacknowledged mode (that is, a broadcast transmission), then the repeater unit can be configured to also output the data to its own host device. 1.1.
455U-D Radio Modem Module • User Manual to all modems in the system, as a broadcast message by using the wildcard address 0. The wildcard address is used to send a message to a group of modems. DATA Data received at the serial port is transmitted out of the radio port, addressed to the configured destination 455U-D module, or to all modules by using address 0. Data received from the radio with the correct addressing is transmitted out of one of the serial ports (RS232 or RS485).
Chapter One Introduction master unit will only link to one slave at any one time. Note that Acknowledged mode only applies to the RS-232 port. The RS-485 port always operates in Unacknowledged mode. To establish a link, the master unit transmits a special “connect” message. This initial message does not include any data. If the addressed slave unit receives the connect message, and is not already connected to another 455U-D unit, it will return an acknowledgment message.
455U-D Radio Modem Module User Manual If the source unit does not receive an ACK message, it will re-transmit the same message. It will attempt to transmit the message the configured number of times (S-Register S30). If the unit still does not receive an ACK message after the configured number of attempts, it will reset the LINK LED, and reset the DCD output on the DB9 RS232 port and reset the DIO output (if configured).
Chapter One 1.4 Introduction Security Encryption Some applications require that the system be made secure from eavesdropping and hacking. To provide for these applications, the modem supports AES-128 data encryption. The modem may be configured to transmit messages with or without encryption, accept messages without encryption, or to require that received messages are encrypted.
455U-D Radio Modem Module User Manual Because of radio start-up delays, the effective radio data rate will be lower than the transmitted data rate. If you are sending large blocks of data, and the serial rate is equal or more than the radio rate, we recommend that you use CTS/RTS flow control to prevent the input buffer from overflowing. 1.5.1 PLC-Mode The 455U-D will operate most efficiently when the serial data rate is higher or the same as the radio data rate.
Chapter One 1.5.3 Introduction Serial Data Rate The communications baud rates supported on both the RS232 serial port and the RS485 serial port are 600, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 31250, 38400, 57600, 76800, 93750, 115200 and 187500 baud - the user selects one of these rates during the configuration of the modem. The RS232 and RS485 ports may be configured with separate data rates. 1.5.
455U-D Radio Modem Module User Manual The time taken to transmit a message is :Section Item Number Time (At 9600 Baud) PEAMBLE Lead-in 40 msec HEADER System Address Header Control Source Address Destination Address Intermediate Address Header Error Check Initialisation Vector Message Data CRC Error Check 40 msec Default (Configurable) 2 Bytes 2 Bytes 1 Byte 1 Byte 1 Byte per address 1 Byte 16 Bytes (if enabled) Data Bytes 2 bytes (if enabled) ENCRYPTION DATA CHECK 2.08 msec 2.08 msec 1.
Chapter One Because each serial port is individually addressed, the 455U-D is able to connect to two serial devices and manage two independent wireless links. This is called Multiple Device Connectivity, or MDC functionality. Introduction RS485 RS485 RS232 Some of the features if MDC are: • Each serial port is configured individually however with the same system address.
455U-D Radio Modem Module User Manual 1.8 Duty Cycle Limiting Some licenses require that the modem limits its communications so that it is transmitting for no more than a maximum proportion of the available time. This applies to European 500mW unlicensed bands, where the modem must limit its duty cycle to 10%. Duty cycle limit is set to 100% except for modems which are configured for the European limited duty cycle bands. To change the duty cycle limit, use the AT#D command. (AT#D100 for 100%).
Chapter One 1.8.2 Introduction Error Check ? Error-checking may be configured in both Unacknowledged and Acknowledged mode. When the error-check is configured, a 16-bit CRC (Cyclic Redundancy Check) attached to the end of each message. This check is used to detect any corruption of the data when it is received at another 455U-D unit. Error checking is individually selected for the RS232 port and the RS485 port.
455U-D Radio Modem Module Chapter Two 2.1 User Manual INSTALLATION General The 455U-D module is housed in a rugged aluminum case suitable for DIN-rail mounting. Terminals will accept wires up to 2.5 sqmm (12 gauge) in size. Normal 110-240V AC supply should not be connected to any terminal of the 455U-D module. Refer to Section 2.3 Power Supply.
Chapter Two Installation ground for paths of 5 km (3 miles). For short distances, the modules will operate reliably with some obstruction of the radio path. Obstructions which are close to either antenna will have more of a blocking effect than obstructions in the middle of the radio path. For example, a group of trees around the antenna is a large obstruction, and the antenna should be raised above the trees.
455U-D Radio Modem Module Antenna Type User Manual Minimum safe distance Dipole 0.4 metres 3dBd Collinear 0.7 metres 6dBd Collinear 0.9 metres 6 element Yagi 1.2 metres 9 element Yagi 1.5 metres 16 element Yagi 2.3 metres Connections between the antenna and coaxial cable should be carefully taped to prevent ingress of moisture. Moisture ingress in the coaxial cable is a common cause for problems with radio systems, as it greatly increases the radio losses.
Chapter Two Installation lengths of cable ( and hence more cable loss) can be tolerated. If more than 20 metres of cable is required for a marginal path 90 installation, then a low loss cable such as 10D-FB, or a higher gain antenna should be used. Collinear antennas should be mounted vertically, at least 1 metre away from a wall or mast. o 2.2.2 Yagi antennas. A Yagi antenna provides high gain in the forward direction, but lower gain in other directions.
455U-D Radio Modem Module User Manual Alternately the 455U can be supplied through the “12V” terminals using a 12-15V supply. For DC supplies, the negative side of the supply is connected to earth (“Earth” terminal). The supply negative is connected to the module case internally. The positive side of the supply must not be connected to earth. The DC supply may be a floating supply or negatively earthed.
Chapter Two Installation 2.4 2.4.1 Serial Connections RS232 Serial Port The serial port is a 9 pin DB9 female and provides for connection to a host device as well as a PC terminal for configuration, field testing and for factory testing. Communication is via standard RS232 signals. The 455U-D is configured as DCE equipment with the pinout detailed below. Hardware handshaking using the CTS/RTS lines is provided. The CTS/RTS lines can be configured to reflect the status of the local unit’s input buffer.
455U-D Radio Modem Module 2.4.2 User Manual RS232 Configuration Port The serial port is a 9 pin DB9 female and provides configuration and diagnostics of both the local module and of other modules in the system wile the primary RS232 port is active. This port is wired as a DCE according to EIA-561. The following table describes the connections required to connect to a PC serial port. The highlighted entries in this table are those essential for operation of the Configuration port.
Chapter Two Installation and may be engaged by operating the single DIP switch in the end plate next to the RS485 terminals. The DIP switch should be in the “1” or “on” position to connect the resistor. If the module is not at one end of the RS485 cable, the switch should be off. 2.5 Discrete I/O Point The 455U-D provides a single connection which can be used as a discrete input for alarms, or a discrete output, to control remote equipment, 2.5.
455U-D Radio Modem Module 2.6 User Manual Dual Redundant Installation Two 455U-D units can be connected together in a dual redundant arrangement. One unit configured as a Primary is normally active, and the Secondary unit is inactive. If the Primary detects an internal fault or operating problem, then the Primary unit becomes inactive and the Secondary becomes active.
Chapter Two Installation messages. Redundant Host Pair If the host device is duplicated as a redundant pair, with an individual host connected to an individual 455U, then RS232 should be used - the 455U will receive and send serial messages, however only the active 455U will transmit via the radio. Dual Redundanct Control Connection The DIO channels on the two units are connected - this connection forms the Dual Redundant Control Connection.
455U-D Radio Modem Module Chapter Three User Manual CONFIGURATION 3.1 Before Configuring Configuration comprises selecting parameter values for the operation of the 455U-D unit. Before you start configuration, parameter settings must be decided. The main parameters are:• Addressing - system address and unit address. • Character type. You need to find out the character type of the host devices connected to the 455U-D units.
Chapter Three Configuration Each module is also configured with a unit address between 1 and 127 - this gives the module a unique identification. The two data ports on the 455U-D can be addressed based on the unit address. The RS232 port is accessed using the unit address, and the RS485 port is accessed using the configured unit address +128. So, to access the RS232 port on unit 7, use address 7. To access the RS485 port on this unit, use address 135 (128+7).
455U-D Radio Modem Module User Manual The configuration program groups all of the configuration details of the units in one system together in one configuration file. The opening screen shows an “empty system”. If configuring a new system, select “Add new modem configuration”. In the left hand column are the 455U units in the system. To add more units, select “System”, and “Add new modem configuration”.
Chapter Three Configuration host system. Connecting to the RJ45 port also allows configuration of remote modems in the system. The cable to connect to the DB9 should have straight-through connections as per section 2.4.1 of this manual. If your PC only has USB serial connections with no RS232 port, you will need to purchase a USB to RS232 converter cable. The cable to connect to the RJ45 Config port should be wired as described in section 2.4.2 of this manual.
455U-D Radio Modem Module 3.4 User Manual Remote Configuration and Diagnostics Most of the configuration features of the 455U-D modem can be accessed remotely over the radio network. Remote configuration is accessed by connecting to the RJ-45 configuration port on the local modem, and using either the configuration software or AT commands. Refer to section 3.3.1 for information on setting up the PC Com port.
Chapter Three Configuration Using AT commands: Connection to the remote modem is accessed using the ATD command on the local RJ-45 configuration port: ATDxxx Remote Configuration and Diagnostics Access (RJ45 port only) ATD3 Access remote diagnostics on station address 3 ATD3,4,5 Access remote diagnostics on station address 5 using stations 3 and 4 as intermediate repeater stations. 3.5 Unacknowledged Mode The default setting of the program is Unacknowledged mode (refer section 1).
455U-D Radio Modem Module User Manual repeater addresses, select the destination module (use the unit address) in the left-hand box. Do not select these boxes. When you click OK, the remote port address is automatically entered into the RS485 path box. You can use the wildcard address 0 if you wish to broadcast messages to all remote units. You can have up to six repeater addresses.
Chapter Three Configuration In this example, the destination port is the RS232 port on unit 15, via repeater 31. If using AT commands: • Auto connect is set by selecting Unacknowledged mode (AT&M0) and fixed line mode (AT&L1) and by configuring a destination address into auto dial location 0 (AT&Z0). • Single connect is set by selecting Unacknowledged mode (AT&M0) and deselecting fixed line mode (AT&L0). In this mode, the modem will go to command mode as soon as it is powered up.
455U-D Radio Modem Module User Manual Broadcast Network You may want a multi-hop network to broadcast messages. This takes some care at the repeater nodes to ensure that individual repeaters do not repeat messages that they have already repeated, and also to avoid a “end-node” receiving the same message multiple times. Note - Before deciding to implement a multi-hop broadcast network, check the section below on Optimum Path Routing.
Chapter Three Configuration The first ring of repeaters (units 14 and 15) need to be configured as below: The “Repeat Messages to address 0” box is selected to allow these units to repeat the broadcast messages on. The “Copy Messages … serial port” box is selected to pass any broadcast radio messages it receives to its host device. The “Hops” box indicates the number of hops that the message has to go through before this unit will repeat the broadcast message.
455U-D Radio Modem Module User Manual Note that the address path for return messages is <21,14,1>. 3.5.4 Multiple Transmissions Units in Unacknowledged mode may be configured to send each message multiple times. The number of transmissions is configured in S-Register S29. The receiving unit will detect repeat messages and only send the data out the serial port once. 3.6 3.6.1 Radio and Serial Configuration Radio Data Rate Select the “Radio” tab and select the radio data rate which you want to use.
Chapter Three Configuration “XON / XOFF” the modem uses the XON and XOFF symbols to control flow of data. This protocol should not be used with raw binary data, as the raw data may contain the XON and XOFF characters. This flow control method is only suitable for use with ASCII data. 3.6.3 Other Settings Select the “Modem” tab: CRC Error Checking for transmitted messages It is normal for error checking to be disabled for Unacknowledged mode and enabled for Acknowledged.
455U-D Radio Modem Module User Manual DCD Control The DCD signal on the RS232 port can be used to give an indication of communications link status in Acknowledged mode. Note that the link is always connected in unacknowledged mode. “Always On” - the 455U-D sets the DCD to be always on “Only High When Connected” - the DCD signal will be on when the link is connected and off when the link is reset “Pulse Low on Disconnect” - the DCD signal will be normally on but will switch off momentarily (for 0.
Chapter Three Configuration If there is no data transfer within the preconfigured “link check” time, the master will send an empty data message to check the communications link. The connection will be broken if a communication failure occurs, or if the local or remote hosts issues a “disconnect” AT command (although this would be unusual for this mode). When the master is disconnected, it will continuously try to connect to its auto-connect address.
455U-D Radio Modem Module User Manual Z3 stores the address that RS-485 messages are sent to. Auto-Connect Slave The only configuration required for a auto-connect slave module is to enter its unit address. It’s address path will be automatically taken from the Connect message from the master unit. If you enter an “Inactivity Timeout” value, then the 455U-D will automatically reset the link if there has been no data transmissions within this time.
Chapter Three Configuration The RS232 DTR signal can be configured to act as a disconnect signal. If so configured (AT&D), the DTR signal will force a hang-up (DCD reset) if the host device resets the DTR signal. In single-connect Acknowledged mode, the host devices use AT commands to select destination addresses to connect to. Normally the only configuration required is a unit address. 3.8 Dual Redundant Standby Two 455U-D units can be connected together in a hot-redundant-standby arrangement.
455U-D Radio Modem Module User Manual If using Hayes commands, Dual Redundancy is set via the AT#O command (“set output function”). ♦ to force a changeover from primary to secondary, use command AT#O5. ♦ to force a changeover from secondary to primary, use the command AT#O6. ♦ the status of the Dual Redundant system is displayed in register S33.
Chapter Three Configuration 3.9 Low Power Mode The modem can be configured for low power shutdown when the DTR signal on the data RS232 port is “reset”. In this state the supply current is reduced to approx 50% of normal load, and the modem will not receive or transmit radio messages. When in low-power shutdown mode, the OK Led flashes red-green at a 2Hz rate (red 400 msec, green 100 msec). This is configured in the Modem/General screen, or using the AT&D Hayes command (AT&D3 to enable).
455U-D Radio Modem Module User Manual To use OPR, select “Use Host Protocol” in the “Operating Mode” section of the configuration screen. Select the host protocol type in the drop-down box below. (Modbus ASCII or RTU, DF1 or DNP3). Path Configuration When “Use Host Protocol” is selected, you can click the “Paths” button to access the routing paths configuration.
Chapter Three Configuration DNP3 The end of the DNP protocol frame is indicated by a period of no data transmission equal to the configured timeout for that serial port (Configured in S19 for the RS232 port and in S21 for the RS485 port). 3.11 Advanced Settings - S Registers These are parameter registers settable by AT commands or the Configuration software to finetune the operation of the 455U. In most applications they do not need to be changed.
455U-D Radio Modem Module User Manual Response from 455U-D Save configuration OK AT&W Exit command mode ATO Note that some commands will automatically exit command mode. Several commands can be run together, for example, ATB2&WO is the same as ATB2 and AT&W and ATO Prior to Configuration Before configuring a module initially, force the module to its factory default configuration either by using the DIP switch (refer section 3.10), or by using the AT&F command.
Chapter Three Configuration This example incorporates a single station connected to Master host device (Address 1), two repeater stations with connected slave host devices (Addresses 14 and 21), and a remote stations with a connected slave host device (Address 36). This example uses Auto Online mode, which routes all messages according to the path set with the &Z0 command. The path set with &Z0 command is configured to broadcast to the entire system.
455U-D Radio Modem Module User Manual ATS17=4 – Set the receive hold-off. This ensures that the repeated messages from the repeaters don’t clash with responses from the directly communicating device (address 15). This command sets the repeater to 200 msec hold-off. Slave devices Site address 36 AT&M0 - Configure mode 0 – Unacknowledged mode. AT&U36 - Set Modem’s address to 36 AT&Z0=21,14,1 - Set all messages to go to master station, address 1 via repeaters 21 and 14..
Chapter Four Troubleshooting Chapter Four TROUBLESHOOTING 4.1 Power-up and Normal Operation When power is initially connected to the 455U-D module, the module will perform internal diagnostics to check its functions. The following table details the status of the indicating LEDs on the front panel under normal operating conditions.
455U-D Radio Modem Module 4.2 User Manual LED indication Diagnostics Chart INDICATOR CONDITION MEANING OK LED OFF Continuously • Power supply failure • Battery Supply Overvoltage OK LED RED Briefly • Module Out of buffer memory (Host device ignores CTS) • Low Supply Current during transmit (Modem resets) OK LED RED Continuously – from startup • CPU Failure • Radio module fault.
Chapter Four Troubleshooting Orange flash† RS485 Serial Port Activity (Older version Hardware) † DCD LED OFF Continuously • No Radio Link established. DCD LED GREEN Continuously • Modem is online & ready to transmit. • In Acknowledged mode, a radio link has been established. DCD LED RED Continuously • Modem is in Command mode, but has a radio link established. • Must send “Online” command (ATO) to modem before communicating to other modems. † Hardware version 1.
455U-D Radio Modem Module User Manual If large radio messages are being transmitted, reduce the maximum message length, and transmit the data in more messages of smaller size. Another common problem is the response time of the host software. Some hosts operate by sending a message from one end and require a response to that message within a certain time. If this time is less than the turn-around time of the radio modem, then the system will not operate.
Chapter Four Troubleshooting Using AT Commands BER may be tested by typing AT#B (Slave Address). The sending unit will repeatedly send pseudo-random frames, and the receiving unit will check these frames for errors. The receiving unit returns a response message indicating how many (if any) errors were found. The test results are displayed on the sending unit. To test Communication to slave station 13, enter AT#B13. To test slave station 14 using station 13 as a repeater, AT#B13,14 etc.
455U-D Radio Modem Module User Manual Most radio tests are carried out using the AT&T2 test as this is the easiest to accomplish. AT&T5 - Received Signal Strength Display This option provides for testing the radio path between two 455U-D units. Although a pair of units may communicate successfully, radio communication may be affected by a range of influences, including atmospheric conditions, changing landscape, degradation of antennas or co-axial cable, low battery voltage etc.
Chapter Four Troubleshooting S-Register Meaning S9 Radio signal strength of last radio message received S12 Reason for radio link resetting in Acknowledged mode - refer App C for codes. S31 Radio Flags, 0 for All OK, Otherwise some Radio faults.
455U-D Radio Modem Module User Manual Refresh Diagnostics information 4.5 Radio Path Testing To carry out a radio path test, you will need two 455U modules. One module will be “fixed” and the other “mobile”. Both units will need power supplies and antennas. The power supply for the mobile unit is normally a 12V battery, but make sure that the battery is fully charged batteries with low voltage will lead to low radio power which will affect the test result.
Chapter Four Troubleshooting Take the mobile module to the other end of the radio path. The antenna at this end can be either held by the tester, or fixed in a temporary fashion. Note that a person’s body will affect the radiation pattern of an antenna, so if the antenna is hand-held and the test is not successful, try again with the antenna fixed to a 1 metre length of plastic pipe or timber. The tester holds the length of pipe or timber with the antenna above head height.
455U-D Radio Modem Module User Manual 4.7 Diagnostic Messages The modem is configured to print diagnostic messages out the RS-232 Configuration port. At startup, this port displays the following messages. Firmware Version ELPRO E455U V3.
Chapter Four Troubleshooting 4.8 Dual Redundancy Two modems can be setup to act as a dual-redundant pair. If one modem fails, the second modem can take over the communications task. One of the modems is designated the Primary modem, and the other is designated the secondary. Redundancy is configured via the AT#O command. #O3 configures the primary modem and #O4 configures the secondary modem. In addition, one of the two modems will be the currently active modem.
455U-D Radio Modem Module User Manual • Use the configuration port to force a changeover from secondary active to primary active, or from primary active to secondary active. - to force a changeover from primary to secondary, use command AT#O5. - to force a changeover from secondary to primary, use the command AT#O6. - the status of the Dual Redundant system is displayed in register S33.
Chapter Five Specifications Chapter Five SPECIFICATIONS General EMC specification EN 301 489 FCC Part 15 Radio specification EN 300 113 RSS-119, AS 4768.1 EN 300 220 FCC Part 90, AS4295 140 x 114 x 30mm Powder-coated, aluminum 5.5 x 4.5 x 1.2 inch DIN rail mount Terminal blocks Removable Suitable for 2.
455U-D Radio Modem Module Receive Sens (BER 10-3) 12.5KHz channel -106 dBm 9600 Baud -112 dBm 4800 Baud -114 dBm 2400 Baud -116 dBm 1200 Baud Signal detect / RSSI -120 to -60 dBm Expected line-of-sight range 30 km @ 19200 baud (25Khz) @ 5W User Manual 35 km @ 9600 baud (12.5Khz) Range may be extended by up to 6 intermediate modules as repeaters.
Chapter Six Chapter Six Warranty WARRANTY & SERVICE We are pleased that you have purchased this product. ELPRO products are warranted to be free from manufacturing defects for the “serviceable lifetime” of the product. The “serviceable lifetime” is limited to the availability of electronic components. If the serviceable life is reached in less than three years following the original purchase from ELPRO, ELPRO will replace the product with an equivalent product if an equivalent product is available.
455U-D Radio Modem Module Appendix A User Manual Hayes Commands The following details all of the Hayes commands supported by the 455U-D. Default settings are shown by a “dot”, • Command Function ATA Answer Incoming Call – The modem can also be set to answer incoming calls immediately or after a certain number of attempts. (See S-Register S0) ATB Set Radio Baud Rate – Radio Baud rates are 1200, 2400, 4800, 9600 and 19200 baud. Some baud rates may not be possible for some country codes.
Appendix A C16 Hayes AT Commands Set 187,500 baud (For Profibus) ATD Connection/Dialing Control. Dial a specific remote or a stored number. This command has a different effect depending on whether it is issued from the RS232 main serial port (connects to the remote modem’s serial ports) or from the Diagnostic serial port (Connects to the remote modems diagnostic functions). ATE Local Echo Control. Enable/Disable Command Echo.
455U-D Radio Modem Module R11 Set 57,600 baud R12 Set 76,800 baud R13 Set 93,750 baud (For Profibus) R14 Set 115,200 baud R15 Set 187,500 baud (For Profibus) User Manual ATSn? Read value from S-Register n (Refer to Appendix C) ATSn=xx Set value of S-Register n to xx (Refer to Appendix C) ATV Verbal/Numeric Response Codes (RJ-45 port always has verbal responses) V0 Numeric response codes on RS-232 serial port V1• Verbose response codes on RS-232 serial port ATX Extended Response Codes.
Appendix A AT#E Hayes AT Commands Encryption Mode (Use security menu AT#S to change encryption key) #E0• Disable security encryption #E1 Enable security encryption on transmitted messages #E2 Enable security encryption on transmitted messages and enforce encryption on received msgs. AT#N Enter Module Serial Number (11 characters Max) (Requires Radio Access AT#R to change).
455U-D Radio Modem Module User Manual &C1• DCD High when connected (Acknowledged Mode) or when online (Unacknowledged mode). Low otherwise. &C2 DCD Always on, Pulses low on Disconnect (Acknowledged Mode) or on Hangup (Unacknowledged mode). AT&D Data Terminal Ready (DTR) Behavior. The host controls DTR. This command controls how the modem reacts to the state of DTR. &D0• Modem ignores DTR, and acts as if it is asserted.
Appendix A Hayes AT Commands &K0• Flow Control Disabled. CTS Always high. Modem ignores RTS. &K1 CTS/RTS Flow Control. CTS follows RTS high if there is space in the local buffer. Otherwise CTS goes low. On Serial Transmit, CTS goes high, and waits for RTS to go high before transmitting. Note: Currently not implemented (Behavior is as for &K3) &K2 CTS/RTS Flow Control. CTS Reflects the state of the remote buffer, AND the local buffer, AND the remote RTS input.
455U-D Radio Modem Module &M5 AT&N User Manual DNP3 Protocol Abort Connection Control. Controls whether the modem will abort a connection attempt if a character is entered. This item is only meaningful with the acknowledged mode of operation. &N0 Ignore characters entered while attempting to make a connection. &N1• If a key is hit while attempting to connect, abort the connection attempt and return to command mode. AT&P Protocol Routing Paths – Up to 100 paths can be stored.
Appendix A AT&T Hayes AT Commands Self Tests. Allows in-field diagnostics, and factory testing. Tests time out after the period configured in S-Register S8 (if not zero). &T0 Stop Tone reversals (See T1 to T4 below). &T1 Transmit tones Modulated at 200 Hz &T2 Transmit tones Modulated at 2400 Hz &T3 Transmit Tones Unmodulated &T4 Transmit Random Modulated tones at current radio baud rate &T5 RSSI Measurement. Monitors the received signal strength, and displays in dBm.
455U-D Radio Modem Module \N0 AT\P User Manual Set Radio to 4800 HZ bandwidth. Radio Power (Can only be set when #R Password entered) 5 Watt Radio .500 mW Radio \P0 Set Radio to 500 mW Set Radio to 10mW \P1 Set Radio to 1 W. Set Radio to 25 mW \P2 Set Radio to 2 W Set Radio to 100 mW \P3 Set Radio to 5 W. Set Radio to 500 mW AT\K Break signal handling control (Currently not implemented) AT\B command from online Host sends break on serial Receive break from remote \K0 Purge Buffers &
Appendix B Response Codes Appendix B Response Codes Response codes display the status of the module in response to user commands. The response code displayed depends on the ATV setting, the ATX setting and the ATQ setting. ATV0 selects numeric response codes. ATV1 selects verbal response codes. The ATXn command selects extended response codes. ATQ0 disables all response messages. ATQ1 enables response messages. The following table describes the messages.
455U-D Radio Modem Module User Manual Appendix C S-Registers The following table lists the S-Registers supported by the 455U-D modem. No. Range Function Comment S0 0-255 Attempts before Answering Call Should normally be set to 1. 0 disables auto answering of calls (ATA command to answer calls only). S1 3-255 Escape Sequence Guard Time Units 20 milliseconds. Min. Delay before and after entering the escape sequence (“+++”) also Max. Delay between characters of the escape sequence.
Appendix C S-Registers S12 = 6 “BUSY” response from remote modem on dial request. S12 = 7 Character received from host while attempting to connect S12 = 8 Hang-up from remote modem. S13 0-255 Spare Function Not Implemented S14 0-255 Max Packet (0–1020 bytes) Max Packet size = S14 x 4. Default 255. S15 0-255 Break Length (Not Implemented) Minimum time to send “BREAK” signal. Units 20 milliseconds. S16 0-255 Transmit Hold-off (0-12.
455U-D Radio Modem Module User Manual S24 0-255 System Address –High Byte The 16-bit system address uniquely identifies the radio network S25 0-255 System Address –Low Byte The 16-bit system address uniquely identifies the radio network S26 0-255 Lead-In Tone Time This selects the Lead-In tone period – units 4 msec. The default (10) should not normally be changed.
