Raveon RV-M7 Spezifikationen PDF herunterladen (Seite 60)

M7 GX Technical Manual 60 Raveon Technologies Corp.

13. Troubleshooting

Symptom: Unit will not receive

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

capitol letters.

Solution #6. Verify the SLOTNUMER is correct. Each radio must be assigned its own unique

SLOTNUM. If two radios use the same SLOTNUM, then they will no be able to hear each other.

Symptom: Unit will not transmit

Solution #1. Verify that CTS is wired. Some devices that could be connected to the RV-M7 will

require the CTS signal to be asserted. The RV-M7 does assert this signal, but if the wire is not

connected, you device may not be outputting data to the RV-M7. If the TX LED blinks, the RV-M7 is

transmitting data. Every time data enters the modem, the TX LED should blink

Solution #2. Verify that serial port timeout is OK. The ATG0 command sets the number of

milliseconds that the RV-M7 will look for in the serial input data stream. If a pause greater than this

value happens, the modem will transmit. If the ATG0 parameter is set very large, say 20000, this

means 2 seconds, and the modem may simply be waiting a long time

Solution #3. Verify that the radio channel is clear or BCL is off. The ATBC 1 command enables

Busy Channel Lockout. If BCL is on, the modem will not transmit on a busy channel. The ATBC 0

command turns it off, and thus the modem will transmit when it needs to, regardless if the channel is

busy. The Status led on the front of the modem is illuminated green whenever the radio channel is

busy (RF present).

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

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