M7 GX Technical Manual
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Raveon Technologies Corp.
ATMK
The network address mask. Default is FFFF.
ATDT
The address of the unit this modem will talk to. Default is 1234.
6. Connect your serial data device to the TXD and RXD pins of the I/O connector.
To connect the M6 to an RS232 serial port, you will need an external digital to
serial level converter.
The M6 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
M6
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.
Setting the RF Rate
The
ATR2 X
command is used to set the over-the-air RF Data Rate. It has one
parameter, X, which is used to specify the bandwidth settings and Modulation type.
RF Data
Rate Setting
(X parameter
value)
OTA
Bit
Rate
Symbol
Rate
Occupied Bandwidth
Modulation
Type
0
800
800
12.5kHz
2-level GFSK
1
1200
1200
12.5kHz
2-level GFSK
2
2400
2400
12.5kHz
2-level GFSK
3
4800
4800
12.5kHz
2-level GFSK
4
8000
4000
12.5kHz
4-level GFSK
5
9600
9600
12.5kHz
2-level GFSK
6
19200
9600
25kHz
4-level GFSK
7
5142
5142
12.5kHz
2-level GFSK
8
9600
4800
25kHz
4-level GFSK
9
2000
2000
12.5kHz
2-level GFSK
10
2-level GFSK
7.2. Programming Channels and Frequencies
The M6 modem has memory for up to 6 channels. A channel is a pair of
frequencies, one for transmit and one for receive. They may be different or they
may be the same. You may program any valid frequency into any channel number.
To program a channel, perform the following steps.
1. Change to the channel you wish to program, using the
ATHP x
command,
where x is the channel number.
2. Program the frequency for this channel x, using the
ATFT
,
ATFR
, or
ATFX
command. Note that the frequency my be entered in MHz as long as you use
a decimal point. For Example, enter
ATFX 450.1
to set the channel frequency
