USER MANUAL (preliminary) Model OEM-900 Frequency-Hopping Spread Spectrum Radio Transceiver Version 1.
Notices and Warnings This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by OMNEX will void the user’s authority to operate the equipment. This product is intended for fixed installation applications.
USER MANUAL 1. FEATURES AND SPECIFICATIONS 1.1 Description The OEM-900 is a credit card sized, board-level 902-928 MHz radio platform specifically designed for industrial applications. Capable of accepting a wide range of input voltages, and able to operate across a broad temperature range, this radio's strength lies in its ability to withstand ISM band interference while ensuring the integrity of each data packet.
USER MANUAL 1.
USER MANUAL 2. CONFIGURATION 2.1 Introduction The RS-232 serial communications interface to the OEM-900 is intended to provide the means of communication with the radio. Data may be passed through this interface normally or the radio may be configured using a specialized subset of the industry standard modem AT command set. 2.2 Data Transfers Data may be sent to or read from the radio link by using this communications interface as one would a regular RS232 serial port.
USER MANUAL Command AT ATE0 ATE1 ATI ATSn=V ATSn? ATD ATZ AT&Z AT&W Description Attention. Returns ‘OK’ when the radio is in configuration mode. Disable echoing of characters when in configuration mode. Default. Enable echoing of characters when in configuration mode. Display software revision information. S register n is changed to value V. (n is a decimal number) The value is S register n is output. Data mode. Used to exit configuration mode and enter data transfer mode.
USER MANUAL Register Name (Attributes) S6 Retransmit Broadcasts (read/write) S7 RF Band (read/write) S8..S9 S10 Reserved RSSI (read only) S11 Link Status (read only) S12 Master ID (read only) S13 Retries (read/write) S14 Maximum Message Wait (read/write) S15 Network Table Flush Timeout (read/write) S16..
USER MANUAL Register Name (Attributes) S26 Buffer Mode (read/write) S27..S29 Reserved S30..S42 Blocked Frequencies (read/write) S43..S49 S50 S51 S52 S53 Reserved Rx Frames Started Diagnostic (read only) Rx Frames Received Diagnostic (read only) Rx CRC Errors Diagnostic (read only) Tx Frames Sent Diagnostic (read only) S54 Tx Heartbeat Frames Diagnostic (read only) S55 Tx Data Frames Diagnostic (read only) S56..
USER MANUAL Register S69, S89 S70, S90 Name (Attributes) (read only) Rx Broadcast Frames Diagnostic (read only) Tx Broadcast Frames Diagnostic (read only) S71, S91 Tx Dropped Frames Diagnostic (read only) S72, S92 Rx Response Frames Diagnostic (read only) S73, S93 Max. Tx Retries Diagnostic (read only) S74..S79 S94..S98 Reserved S99 Test Mode (read/write) S100..S127 Reserved Description Valid Range: 0..
USER MANUAL 3. TROUBLESHOOTING 3.1 Diagnostic Registers The S-register diagnostic counters are intended for use in troubleshooting a live communications link in the field. As a result, many of these S-registers are quantitatively inter-related to indicate just how well communication is progressing.
USER MANUAL 3.2 Test Modes The various test modes are intended as a means of testing the radio for FCC approval and are not normally available for use by the end-user. Entering into a test mode is to be accomplished by writing the eight-bit test number to Sregister S99, as shown below: EXAMPLE: The host sets the radio’s test mode. Host: Radio: ATS99=2 OK Exiting from test mode may only be accomplished by the cycling of power to the radio. Table 3.
USER MANUAL 4. ANTENNAS NOTE: The FCC and ISC require that the antenna be restricted to that supplied by the manufacturer and approved for use with this product. A 0dB quarterwave omni antenna is normally supplied. For other antenna options, please contact OMNEX Control Systems Inc. ! Caution It is important for proper operation of the OEM-900 that when multiple systems are to be installed, there is ample space between the antennas.
USER MANUAL Antenna height (feet) 90 75 60 45 30 15 0 2 4 6 8 10 12 14 16 Distance between antenna (miles) Figure 4.1-1 (Antenna height calculation) 4.2 Mounting The OEM-900 operates at 902 - 928 MHz. Radio signals at these frequencies do not bend around objects but they do bounce and reflect off objects. However, each reflection robs the signal of some of its energy. To maximize the received power, the transmitter antenna should be mounted within line of sight of the receiver antenna.
USER MANUAL APPENDIX A - OEM-900 RS232 Pin-Out Connection Diagram 1 2 13 14 Y G R RF Power Connector Pin Number Description 1 Ground 2 Positive Power (9-30VDC) 3 RF LED indicator 4 RS232 CTS (in) 5 TX LED indicator 6 RS232 RTS (out) 7 I/O #1 8 RS232 Receive (in) 9 I/O #2 10 RS232 Transmit (out) 11 Auxiliary In/Out #2 12 Auxiliary In/Out #1 (RSSI) 13 +4VDC Out 14 Ground Indicator Lights Light Color Description Yellow On solid if connected to another radio, otherwise flashes.
USER MANUAL APPENDIX B – OEM-900 TTL Connection Diagram 1 7 Y G R RF Power Connector Pin Number Description 1 Positive Power (9-30VDC) 2 TTL level RTS (out) 3 TTL level CTS (in) 4 TTL level Receive (in) 5 TTL level Transmit (out) 6 Auxiliary In/Out #1 (RSSI) Indicator Lights Light Color Description Yellow On solid if connected to another radio, otherwise flashes. Green Blinks when transmitting serial data out the serial port. Red Blinks when receiving serial data from the serial port.
USER MANUAL Warranty OMNEX Control Systems Inc. Warrants to the original purchaser that the OMNEX products are free from defects in materials and workmanship under normal use and service for a period of ONE YEAR, parts (EXCLUDING: SWITCHES, CRYSTALS, OR PARTS SUBJECT TO UNAUTHORIZED REPAIR OR MODIFICATION) and labor from the date of delivery as evidenced by a copy of the receipt.
