CRESCENDO VHF HALF-DUPLEX USER MANUAL
Crescendo VHF Half-Duplex User Manual DISCLAIMER © 2012 RF Innovations Pty Ltd. All rights reserved. RF Innovations reserves the right to make improvements on the product in this manual at any time without notice. No part of this manual may be produced, copied, translated, or transmitted in any form or by any means without the written permission of RF Innovations. Information provided in this manual is intended to be accurate and reliable.
Contents Contents 1. Introduction ................................................................................................................................................................................... 6 2. Installation ..................................................................................................................................................................................... 7 2.1 General considerations.....................................................................
Contents 5.6.2 RSSI ................................................................................................................................................................................ 30 5.6.3 Monitor RSSI .................................................................................................................................................................. 30 5.6.4 PRBS Generator...........................................................................................................
Contents A.4 Dimensions ............................................................................................................................................................................. 57 A.4.1 Mounting Plate Dimensions ........................................................................................................................................... 58 Appendix B Management Reference ........................................................................................................
Introduction 1. Introduction Crescendo is a series of data-driven and packet-driven radio modems for high-speed data applications. This manual is specific to Crescendo VHF Half-Duplex. Some of the relevant features of this model include: Full VHF band switching (148-174MHz) 5W (+ 37dBm) maximum transmit power Wideband (25kHz) or narrowband (12.5kHz) channels, with software selectable frequency raster (6.25kHz, 12.5kHz or 25kHz) Raw air rate 19.2Kbit/s (25kHz channels) or 9.6Kbit/s (12.
Installation 2. Installation 2.1 General considerations There are a number of guidelines to observe when installing a Crescendo. Antenna selection is vital to a good RF link. Different antennas are required depending on the application. Please contact your antenna manufacturer or RF Innovations for correct antenna selection. Antenna placement has a significant impact on RF link performance. In general, higher antenna placement results in a better communication link.
Installation 2.3 Safety and Compliance 2.3.1 Human Exposure to Emissions To limit human exposure, the following guidelines should be observed: 1. Take reasonable precautions in any installation to maintain a clearance of no less than 1 m (one metre) from the antenna to any person. 2. Do not apply power to the device unless the clearance described in 1 above has been allowed. The guidelines above apply when transmitting at maximum power, with an antenna gain of up to 13 dB.
Configuration 3. Configuration 3.1 Overview The Crescendo provides four user interfaces that allow the radio to be configured and its performance to be monitored: 1. Cruise Control management interface: All radio configuration and diagnostics parameters can be accessed using the Windows-based Cruise Control Graphical User Interface (GUI). 2. Terminal menu interface: A menu system is available over either of the Crescendo‟s serial ports.
Configuration 3.2 Cruise Control The following sections briefly outline how to use Cruise Control with the Crescendo. For more information, see the Cruise Control Manual. Figure 1 below is a typical screenshot of the Cruise Control Configuration Tool. Figure 1: Cruise Control Configuration Tool 3.2.1 Installation The requirements for using the Cruise Control application are: Pentium III+ Windows based machine. At least 1 available serial port.
Configuration Use the Device -> Connect to Local Device menu item to connect to the local device. Once all the settings have been downloaded from the device, the available configuration groups are displayed in a tree on the left. The items that can be configured in each group are displayed in tables on the right. The names of editable items are displayed in black. Read only items have their names in grey.
Configuration 3.4 Hayes AT Command Interface The Crescendo radio supports Hayes ATtention commands. These are used to query radio configuration and performance parameters, set radio configuration, and establish communication links between radios over the air. For a port to accept AT commands it must be first in local command mode. See section 6.5.3 on page 36 for information on enabling and disabling local command mode.
Configuration 3.5 Front Panel Interface The front panel interface allows for real-time monitoring of radio parameters without external equipment. The front panel can also be used to enable the menu on the Crescendo‟s auxiliary port regardless of the current serial port configuration. There are six front panel modes. To select a front panel mode, press the front panel button. The current panel mode is shown by lighting a single red LED.
Configuration Table 3: Front panel RSSI, transmit power, and temperature modes 3.5.2 Main Serial Port Status (Mode 5) LED Description (1) DCD Green when the DCD output is low, red when it is high. (2) DTR Green when the DTR input is low, red when it is high. (3) Tx Serial Data Flashes green when serial data is transmitted from the Crescendo on either serial port. (4) Rx Serial Data Flashes green when serial data is received by the Crescendo on either serial port.
Configuration Control under Main -> Diagnostics -> Faults. Faults that are detected by the radio are: Point-to-point destination address equal to source address Reserve section of a datagram packet not equal to 0x0000. The last time the radio reset was due to a watchdog reset. When a fault occurs, it is latched for 15 minutes. If after 15 minutes the alarm has not re-occurred it is cleared. The fault can be cleared manually by re-powering the radio.
Serial Port Operation 4. Serial Port Operation 4.1 Overview The Crescendo radio has two DCE RS-232 serial ports with DB9 connectors. The serial port pin outs can be found in Appendix A.3 on page 56. The main port supports: TX, RX, and GND. RTS and DTR inputs. CTS and DCD outputs. While the auxiliary port supports: TX, RX, and GND. Both serial ports support over the air data transfer. In general, due to the presence of control lines, the main port should be used as the main data port.
Serial Port Operation 4.2 Configuration Main -> Serial Port -> Settings Both main and auxiliary serial ports support the following configuration options: Baud rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600 or 115200. Data bits: 7 or 8 Parity: None, odd, or even Stop bits: 1 or 2 4.3 Advanced Features 4.3.
Serial Port Operation 4.3.2 Packetiser Timers Main -> Serial Port -> Settings Many protocols delimit packets of data by silence on the communications line for a set period of time. A common example of such a protocol is Modbus. Due to the framed structure over the air when the radio is in packet driven mode, packetiser timers should be used to support protocols and increase the efficiency of data transmission. Packetiser timers can be set between 0 and 10000ms.
Serial Port Operation Channel Width TX Timer 12.5 kHz >= 25ms 25 kHz >= 13ms Table 7: TX packetisation timers for different channel widths Using packetiser timers will increase the latency induced by the radio system, as no part of the packet can be transmitted until it has been fully received. Main -> Serial Port -> Settings 4.4 Statistics Statistics are maintained for each serial port and these can be used to analyse and debug problems.
Serial Port Operation These statistics can be used to isolate a number of potential problems in a Crescendo system. A large number of Rx framing errors indicates that the radio serial port configuration (baud, data bits, parity, and stop bits) does not match the serial port configuration of the DTE. A large number of Rx overflow errors indicate that the DTE is supplying data faster than it can be transferred over the air.
Radio Operation 5. Radio Operation This section describes the two modes of Crescendo operation: data and packet-driven. These modes underlie the different protocols supported, described in section 6. Regardless of the mode used serial characters are assembled in small blocks for the purpose of Forward Error Correction (FEC). These blocks are then subject to error coding / interleaving, and protected by a CRC.
Radio Operation If a payload packet or ACK is lost, resulting in the base radio not receiving the ACK, the source radio retransmits the payload packet. This continues until the number of retries for the packet has been exhausted. 5.2.1 Data Path Internally, the Crescendo stores a set of payload frames that are waiting to be transmitted, and a set of payload frames that have been received but not yet processed.
Radio Operation Link quality: The quality of a link can have a substantial impact on the latency induced by the radio. The Crescendo will retry packets that become corrupted due to RF interference, configurable between 0 and 20 retries. The more retries that are required to successfully transmit a packet, the greater the latency induced. This is only applicable to packet driven mode.
Radio Operation 5.3.2 Transmit Power Main -> Radio The transmit power of the Crescendo can be configured to transmit at fixed levels into a 50 load: 0dBm (1mW) +20dBm (100mW) +27dBm (500mW) +30dBm (1W) +36dBm (4W) +37dBm (5W) A maximum power setting can be configured by the distributor to limit the allowable power for a given combination of radio and antenna. 5.3.3 RSSI Trip Main -> Radio The RSSI trip setting is the lowest RF signal level for which the radio modem will attempt to acquire data.
Radio Operation Broadcast retransmissions: The number of retries to use on data that is destined for multiple radios. This is applied to any transmission when using the point-to-multipoint protocol, or to any packet addressed to the broadcast address when using the datagram protocol. When a unit is broadcasting data, the transmission cannot be acknowledged, as collisions would occur between the acknowledgements.
Radio Operation Base Base Subnet Remote 2 Remote 1 Store-and-forward Repeater Repeater Subnet Remote 3 Remote 4 Figure 5: Crescendo tree network topology When allocating radio addresses, a recommended convention is to reserve the first two decimal digits as the subnet number, and the last three digits for individual radios residing within the subnet. For example, consider the scenario shown in Figure 5, and the address allocation given in Table 10.
Radio Operation 5.4.2 Network Address Main -> Radio -> Network The network address is a high level address used to differentiate between co-located networks. For a unit to send to or receive from another unit, their network addresses must match. A co-located network should not be confused with a base or repeater subnet (see section 5.4.1) Figure 6 shows an example of two co-located networks.
Radio Operation 5.4.3 Store-and-forward Repeater A Crescendo unit may be configured to operate as a store-and-forward repeater (see Appendix B.1). A storeand-forward repeater can be used to extend the range of a network. It behaves as a combination of base and remote unit in the following manner: If a packet is received over the air which is addressed to the repeater, the packet data will be transmitted out the serial port.
Radio Operation Main -> Radio -> Network -> Routing Table 5.5.2 Routing Table Complete control can be maintained over the routing of data through a Crescendo network by configuring the routing table. The routing table consists of 16 entries on each unit which specify rules to apply for data with destination addresses within a particular range. The destination of point-to-point data is simply the point-to-point destination address (see section 6.3 on page 34).
Radio Operation 5.6 Diagnostics 5.6.1 Data Quality Main -> Link Control The Crescendo continually measures the „quality‟ of the received signal by comparing the received waveform against an internally generated „ideal‟ baseband signal. The result is a value from 0-255 that is indicative of the quality of the data. In general, a data quality of greater than 100 is good, and less then 50 is poor. The following data quality values are kept: Data Quality: The most recent data quality measurement.
Radio Operation BASEBAND STATISTICS Name Number Description Tx Sync 0 The total number of symbol/frame synchronisations sent for the start of a packet transmission. Tx ReSync 1 The total number symbol/frame resynchronisations. Rx Sync 2 The total number of symbol/frame synchronisations received for the start of a packet. Rx ReSync 3 The total number of symbol/frame resynchronisations received.
Radio Operation PACKET DRIVEN MAC STATISTICS Name Number Description Tx Bytes 0 The number of bytes that have been transmitted. Rx Bytes 1 The number of bytes that have been received and processed. Tx Packets 3 The total number of packets that have been transmitted correctly. Rx Good Packets 4 The total number packets that have been received correctly.
Protocol Operation 6. Protocol Operation 6.1 Overview Both of the Crescendo‟s serial ports can be independently configured with different protocol modes. Protocol modes serve two purposes: Provide methods for configuring the radio for operation, and for interrogating it in order to determine current operational status. Allow the Crescendo radio to determine how data received on its serial ports is to be converted into RF packets.
Protocol Operation 6.3 Point-to-point Protocol Main -> Protocol The point-to-point protocol establishes a connection between two end points. Both end points must have the point-to-point protocol selected on the same serial port, and have the point-to-point destination set to the remote radio modem address. There are two operational modes configurable for the point-to-point protocol: Connection Based: This mode of operation provides a connection oriented link.
Protocol Operation 6.4.2 Local Mode Both point-to-point and point-to-multipoint protocol modes allow local command mode to be entered using the escape sequence (section 6.5.3 on page 36). Returning to online mode is achieved using the online command (ATO). The protocol can also be configured to start in local command mode when power is applied. For data to be transferred between two end units, both units must be online, not in local command mode.
Protocol Operation 6.5.2 Answering The Crescendo provides two options for answering dial-up calls: Auto-answer: In auto-answer mode, when a connection request is made the Crescendo will output a configurable number of RING responses on the destination, then automatically connect. Manual answer: When in manual answer mode, the Crescendo will output a RING response on the destination once per second until the ATA command is received, at which point the connection is established.
Protocol Operation 6.5.5 DTR Modes In addition to the AT commands that are used to control the dial-up connection, DTR may be configured to provide similar functionality. Only the main port supports DTR, so the setting for DTR mode on the auxiliary port Hayes protocol is not used. There are four available DTR modes: Ignore DTR: DTR is not used to control the Hayes communications settings. Hangup on DTR Low: If DTR is low then the radio will hang-up the current connection.
Protocol Operation 6.6 Modbus RTU Protocol Main -> Protocol -> Modbus When using the Modbus RTU protocol, the Crescendo expects Modbus RTU packets on the serial port in the following format. Start T1-T2-T3-T4 Address (1 byte) Function (1 byte) Data (0…251 bytes) CRC (2 bytes) Figure 8: Datagram protocol packet format The fields of a Modbus packet are: Start: A silent interval of at least 3.5 character times. Address (8-bit): The address of the slave unit in the Modbus transaction.
Protocol Operation 6.8 Datagram Protocol When using the datagram protocol, packets are passed to the Crescendo to be transmitted over the air. The packet format is given in Figure 10. Start 0xC1 Length (16) Destination (16) Source (16) DP SP (2) (2) Res. (4) Data (1…Slot Size) CRC (32) Figure 10: Datagram protocol packet format Note that the number of data bytes in a datagram packet must be no greater than the max packet size configured.
Protocol Operation Start 0xC1 Length 0x0009 Destination 0x0001 Source 0x0000 DP / SP / Res 0x00 Data 0x54 0x45 0x53 0x54 CRC 0x9496D61C Figure 11: Example datagram protocol packet Datagram protocol applications are given in section 7.4. 6.9 RF Link Status Main -> Protocol The Crescendo provides an RF link status indication for each serial port. The RF link status depends on the protocol mode being used and the current state of that protocol.
Protocol Operation Unused: The protocol mapping entry is not used. Single: For a single entry, the packet is sent to the associated radio address if the protocol address matches the first address. The last address is ignored. This is a “one-to-one” mapping. Mapped: For a mapped entry, the mapping is applied if the protocol address is within the range specified by the first and last addresses. To determine the radio address, the offset from the first address is added to the associated radio address entry.
Protocol Operation For the example in Figure 12 the following mapping would occur: 1. A protocol packet with an address of 1 would be sent to radio address 1001. 2. A protocol packet with an address of 4 would be sent to radio address 1004. 3. A protocol packet with an address of 9 would be sent to radio address 1009. 4. A protocol packet with an address of 10 would be sent to radio address 1010. 5. A protocol packet with an address of 11 would be sent to radio address 1011. 6.
Applications 7. Applications This section presents typical Crescendo usage scenarios. The aim of these scenarios is to illustrate radio configuration. 7.1 Point-to-point Networks 7.1.1 Basic Point-to-point Network The simplest point-to-point network consists of two units configured such that the point-to-point destination of one unit is the address of the other. This scenario is shown in Figure 13.
Applications Crescendo Remote PROTOCOL CONFIGURATION Main: Point-to-point to 1000 1001 SERIAL CONFIGURATION Main Port: 19200, 8N1, Hardware Flow DTE Main RADIO CONFIGURATION Address: 1000 Crescendo Base PROTOCOL CONFIGURATION Main: Point-to-point to 1001 Aux: Point-to-point to 1002 Aux: Start in local disabled RADIO CONFIGURATION Address: 1001 1000 Main Aux DTE DTE SERIAL CONFIGURATION Main Port: 19200, 8N1, Hardware Flow Aux Port: 19200, 8N1 Crescendo Remote RADIO CONFIGURATION Address: 100
Applications Crescendo Remote 1001 1000 Main DTE SERIAL CONFIGURATION Main Port: 19200, 8N1, Hardware Flow DTE Crescendo Base PROTOCOL CONFIGURATION Main Port: Point-to-point to 1001 or 1002 PROTOCOL CONFIGURATION Main Port: Point-to-point to 1000 SERIAL CONFIGURATION Main Port: 19200, 8N1, Hardware Flow Main RADIO CONFIGURATION Address: 1000 RADIO CONFIGURATION Address: 1001 Crescendo Remote 1002 PROTOCOL CONFIGURATION Main Port: Point-to-point to 1000 SERIAL CONFIGURATION Main Port: 19200, 8N
Applications RADIO CONFIGURATION Rx Address: 1000 Repeaters in Network: 1 Crescendo Base 1000 ROUTING TABLE Route 2000-2999 to 2000 Main SERIAL CONFIGURATION Main Port: 38400, 8N1, Hardware Flow Crescendo Repeater DTE PROTOCOL CONFIGURATION Main Port: Point-to-point to 2001 RADIO CONFIGURATION Rx Address: 2000 Store and Forward Repeater: True Repeaters in Network: 1 2000 PROTOCOL CONFIGURATION Main Port: Hayes Dial-up SERIAL CONFIGURATION Main Port: 38400, 8N1, Hardware Flow RADIO CONFIGURATION R
Applications Crescendo Remote 1001 PROTOCOL CONFIGURATION Main Port: Point-to-multipoint DTE Crescendo Base PROTOCOL CONFIGURATION Main Port: Point-to-multipoint SERIAL CONFIGURATION Main Port: 19200, 8N1, Hardware Flow Main RADIO CONFIGURATION Address: 1000 RADIO CONFIGURATION Address: 1001 1000 Main DTE SERIAL CONFIGURATION Main Port: 19200, 8N1, Hardware Flow Crescendo Remote 1002 PROTOCOL CONFIGURATION Main Port: Point-to-multipoint SERIAL CONFIGURATION Main Port: 19200, 8N1, Hardware Flow
Applications 7.2.2 Point-to-multipoint Network with Roaming Remote In some applications the remote unit may be mobile, and needs to „roam‟ between areas of coverage. A point-to-multipoint network configured for this purpose is shown in Figure 18.
Applications 7.3 Hayes Dial-up Networks 7.3.1 Basic Hayes Dial-up Network A basic Hayes dial-up network is given in Figure 19.
Applications RADIO CONFIGURATION Rx Address: 1000 Repeaters in Network: 2 Crescendo Base 1000 ROUTING TABLE Route 2000-3999 to 2000 Main SERIAL CONFIGURATION Main Port: 38400, 8N1, Hardware Flow Crescendo Repeater DTE PROTOCOL CONFIGURATION Main Port: Hayes Dial-up RADIO CONFIGURATION Rx Address: 2000 Store and Forward Repeater: True Repeaters in Network: 2 2000 ROUTING TABLE Route 3000-3999 to 3000 Main DTE PROTOCOL CONFIGURATION Main Port: Hayes Dial-up RADIO CONFIGURATION Rx Address: 3000 S
Applications 7.4 Modbus RTU Network with Repeater A Modbus network with repeater is shown in Figure 21.
Applications 7.5 DNP Network with Repeater A DNP network with repeater is shown in Figure 22.
Applications Crescendo Remote 1 1001 PROTOCOL CONFIGURATION Main Port: Datagram 1000 Main DTE SERIAL CONFIGURATION Main Port: 38400, 8N1, Hardware Flow DTE Crescendo Base PROTOCOL CONFIGURATION Main Port: Datagram SERIAL CONFIGURATION Main Port: 38400, 8N1, Hardware Flow Main RADIO CONFIGURATION Rx Address: 1000 RADIO CONFIGURATION Rx Address: 1001 Crescendo Remote 2 1002 PROTOCOL CONFIGURATION Main Port: Datagram SERIAL CONFIGURATION Main Port: 38400, 8N1, Hardware Flow DTE Main RADIO CONFI
Appendix A Technical Specifications Appendix A Technical Specifications A.1 Type Approvals Australia/ New Zealand AS 4295 -1995 Australian Supplier ID: N161 FCC (planned) CFR 47 Part 15 and Part 90 FCC ID P5MRFI150H Industry Canada (planned) RSS-GEN, RSS-102, RSS-119 IC: XXXXXX-RFI150H ETSI (planned) ETS 300 113 Table 16: Type approvals A.2 Radio Modem Specifications RF Switching Bandwidth 148 – 174 MHz RF Channel Bandwidth Model specific: 12.
Appendix A Technical Specifications Input Voltage 9V to 16VDC (negative ground) Environmental Specifications Temperature: -10 to +60ºC Humidity (max): 95% non-condensing at 50ºC Connectors: Power: Phoenix PH1776508 Main Serial Port: DB9 RS-232 Female Auxiliary Serial Port: DB9 RS-232 Female Serial Port Impedance: 3-7 kohm nominal RF: BNC Female (50 ohm nominal) Table 17: Radio modem specifications A.2.
Appendix A Technical Specifications A.3 Connectors Pin Assignments A.3.1 Main Serial Port PIN Function Direction 1 DCD Output 2 RxD Output 3 TxD Input 4 DTR Input 5 GND 6 N/A 7 RTS Input 8 CTS Output 9 N/A Table 19: Main connector pin-out A.3.
Appendix A Technical Specifications A.4 Dimensions Length 158 mm Width 101.6 mm Height 43.
Appendix A Technical Specifications A.4.
Appendix B Management Reference Appendix B Management Reference B.1 Radio Configuration Radio Page AT Address Sets the radio local address, 0-61439 23 S51 Tx Power The output power. 24 S45 RSSI Trip Set the RF signal level for RF data. 24 S53 Network Address The network address 27 S50 Store and Forward Repeater Enables store-and-forward functionality 28 &L Repeaters In Network Sets the maximum number of repeaters for a destination for acknowledgement timing.
Appendix B Management Reference Lowest Data Quality Shows lowest data quality received so far (0255) Temperature The temperature of the unit. Average Noise The average RSSI level where no valid carrier is present on the receive channel. 30 I11 Average RSSI The average RSSI level while data is being received. 30 I12 Last RSSI The RSSI level for the last valid data received. 30 I31 Bad Trigger The RSSI value for the last bad Trigger received.
Appendix B Management Reference B.4 Protocol Mode Configuration and Diagnostics Protocol Page AT Lead-in Count The number of lead-in bytes the radio will discard and not transmit over the air. 33 S73 Data timeout The period of serial silence the radio will wait before it stops transmitting. 33 S74 RF Link Status The state of the RF link for the port.
Appendix B Management Reference B.5 Diagnostics Diagnostics Page AT Fault The last fault that was reported. Startup Reason Indicates if the radio started normally or due to a watchdog reset. EEPROM Status The state of the EEPROM at start-up. R10 Build Date The date that the firmware was built. R9 Monitor RSSI Puts the radio in a mode when it continuously outputs the RSSI on the current channel (can only be used in menu). Factory Reset Resets all settings to factory defaults.
Appendix C Hayes References Appendix C Hayes References C.1 General Commands Command ATE Name Echo Notes Returns 1 if Hayes echo is enabled, or 0 if echo is disabled. ATE0 Disables Hayes echo. ATE1 Enables Hayes echo. ATQ Responses Returns 1 if Hayes responses are enabled, or 0 if responses are disabled. ATQ0 Disables Hayes responses. ATQ1 Enables Hayes responses. ATV Verbal Responses Returns 1 if verbal responses are enabled, or 0 if verbal responses are disabled.
Appendix C Hayes References AT&V1 View All I Registers AT&V2 View All S Registers AT&W Save Configuration AT? Enable Menu AT%30 Enable Cruise Control Saves the current configuration to EEPROM. Enables the Cruise Control on the serial port. Wait for 10 seconds after executing with no further data input to return to normal Hayes mode. Table 29: Hayes general commands C.
Appendix C Hayes References ATI25[s] Get Baseband Statistic ATI26[s] Get Data Driven MAC Statistic ATI27[s] Get Packet Driven MAC Statistic ATI50 Channel Width Table 31: Hayes I-register commands C.4 S-Registers All serial port configuration and status commands can be executed on either the main port or auxiliary port. The parameter [p] that may be passed to each serial port AT command should be set to 0 for main, or 1 for auxiliary.
Appendix C Hayes References Command Name Notes ATS52 Point-to-point Destination Address ATS53 RSSI Trip ATS54 Current Channel ATS60 Log Filter 0: Faults 1: Warnings 2: Status 3: Information 4: Debugging ATS64 Point-to-[multi]point Receive Addressing 0: Strict 1: Relaxed ATS70 Protocol Mode 0: Point-to-point 1: Point-to-multipoint 2: Hayes Dial-up 3: Datagram 4: Log ATS71 Point-to-point Mode 0: Connectionless 1: Connection Based ATS90 Main Port DCD Mode This command cannot have a [p] p
Appendix C Hayes References Command ATS93 Name Get Main Port RTS Mode Notes This command cannot have a [p] port specifier. 0: Line is not asserted. 1: Line is asserted. ATS100 Baud 0: 110 1: 300 2: 600 3: 1200 4: 2400 5: 4800 6: 9600 7: 14400 8: 19200 9: 38400 ATS101 Parity 0: None 1: Even 2: Odd ATS102 Data Bits 0: 7 1: 8 ATS103 Stop Bits 0: 1 1: 2 ATS104 Main Port Flow Control This command cannot have a [p] port specifier.
Appendix C Hayes References C.
Appendix D Factory Defaults Appendix D Factory Defaults Group Radio Network Channel Serial Ports Parameter Default Value Address 1000 Tx Power 30 dBm RSSI Trip -110 Network Address 0 Store and Forward Repeater Disabled Repeaters in Network 0 Max Packet Size 4096 bytes Broadcast Retransmissions 5 Singlecast Retries 5 Routing Table Channel Width 12.
Appendix D Factory Defaults (table continued from previous page) Protocol Mapping Mode Main: Data Driven Aux: Hayes Dial-up Point-to-point Destination 20 Start In Local Mode Main: Disabled Aux: Enabled Point-to-point Mode Connection Based Receive Addressing Strict Footer Mode CRC-32 Wait for Carrier 10 seconds Auto-Answer On Rings Before Answer 3 DTR Mode Ignore Echo On Response On Verbal Responses On Escape Guard Time 1000 ms Escape Guard Character + Lead-in Count 0
Appendix E Product Identification Table Appendix E Product Identification Table Table 35 shows the Crescendo product identification. The green shaded items are the available configurations. This table should be used when ordering a Crescendo radio modem. FREQUENCY BAND RF MODE CHANNEL BANDWIDTH OPERATING MODE AIR RATE COMPLIANCE CLASSIFICATIO N 150 VHF H Half Duplex N 12.
Appendix F Glossary Appendix F Glossary ACK Acknowledgement ARQ Automatic Repeat Request BNC British Naval Connector CRC Cyclic Redundancy Check CTS Clear To Send DCD Data Carrier Detect DCE Data Communications Equipment (radio modem) DTE Data Terminal Equipment (computer device) DTR Data Terminal Ready RF Radio Frequency RSSI Received Signal Strength Indicator RTS Request To Send Rx Receive Tx Transmit VHF Very High Frequency Table 36: Glossary Crescendo VHF Half-Duplex User
Index Index Addressing.......................................................................... 23 Answering .......................................................................... 36 Applications ....................................................................... 43 AT Commands ................................................................... 12 Auto-answer ....................................................................... 36 Broadcast retransmissions .......................................
Index Manual answer ................................................................... 36 Max Packet Size ................................................................. 25 Menu .................................................................................. 11 Mode 1 ............................................................................... 14 Mode 2 ............................................................................... 13 Mode 3 ..........................................................
