User's Manual

Company Confidential 60 Raveon Technologies Corp.

5. Using the M7 Modem – Packet Mode

5.1. Setup

1. Connect a DC power source to the DC IN connection on the front of the

modem.

2. Connect a good quality antenna, cut to the operating frequency, to the BNC

connector on the front of the modem. Use a good antenna, and place is at

high-above obstructions as possible.

3. Connect a computer terminal, or PC computer running HyperTerminal, to the

9-pin I/O connector. The factory default serial ports settings are 9600 bps, 8

data bits, 1 stop, no parity.

4. Program the modem’s operating frequency to your desired operating

frequency. This is done with the ATFX xxx.xxxxx command. See the section

“Serial Port Commands” for information describing the various parameters

that may be modified in the modem. In most applications, the default settings

from the factory will work fine.

5. Using the AT commands, change any of the default operating parameters that

ust be modified. From the factory, the modems are configured and shipped

ready-to-use. Out of the box, they will communicate on the default radio

channel using the factory defaults. In general, the parameters you may want

to modify will be:

ATHP x Channel number to use (1-5).

ATMT 0 0 for normal Packetized operation. Default mode.

ATAK 0 for no ARQ, 1 if this unit sends ACKs. Default is no ARQ.

ATRB Set the number of retries if ARQ is used (x). 0 if no ARQ used.

Factory default is no ARQ.

ATBD Serial port baud rate

ATMY The ID of this unit. Default is 1234.

ATMK The network address mask. Default is FFFF.

ATDT The address of the unit this modem will talk to. Default is 1234.

ATBC Enable/disable busy channel lock-out.

6. Connect your serial data device to the 9-pin connector on the front of the

odem.

The radio is now ready to use. Any serial data going into the modem will be

transmitted over the air, and any data received over the air will be sent out the

serial port.

Remember, that from the factory, all M7 modems are configured to simply work.

Plug in power and connect to the serial port at 9600 baud, and the modems will

communicate on the default channel. Change the channel frequency to your

specific frequency, and they will be ready to work on your channel.