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Solution #1. Verify that the modem is on the correct RF channel. If it is, the Status LED should blink green every time another modem tries to transmit to it. If the Status LED does not blink when it should be receiving, it is on the wrong RF frequency.

Soultion #2. If the addresses match, and Status LED blinks green but still no reception of data, verify that the RTS signal is asserted. The RV-M7 will not output data if the RTS signal on the DB-9 I/O connector is not asserted. If the user’s hardware cannot assert the RTS hardware line, disable hardware flow control in the RV-M7 modem, using the ATCH 0 command.

Solution #3. If the Status LED blinks green, verify that the Unit Address of the sending modem matches the unit address of the receiving modem. If this is OK, verify that the over-the-air baud rate of all modems is the same (ATR2 command).

Solution #4. Verify Low Power Mode. The RV-M7 has an optional Low Power Mode (LPM). If LPM is enabled, the RV-M7 will power down whenever the DTR line of the serial port is turned off. The Power LED will blink once every 10 seconds in the LPM mode. The ATSM command is used to set or read the Low Power Mode. ATSM 1 enables it, and ATSM 0 disables it. If LPM is used (ATSM 1), then the RV-M7 will turn off when the DTR line is off, or the program connected to the serial port is closed, or the RS-232 connector is un plugged.

Solution #5. Verify the KEYPHRASE is correct. If encryption is used, the KEYPHRASE is set to a unique word, and must be the same in all radios in the system. If it is not used in the radio system, then the KEYPHRASE in all units must be disabled or left at the factory default. To disable encryption, use the KEYPHRASE 0 command. The factory default KEYPHRASE is RAVEON, in all capital letters.

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