805U Radio Modem Module
User Manual
Page
38
©
November 2004
AT&U
Unit Address Range 0-127. Default 1. This is also the second group
address for transparent repeaters.
Configuration of Data Rates and Character Type
ATB
Radio Baud Rate
The radio rate must be the same in all modules
B0
19,200 baud (default)
B2
76,800 baud
B1
38,400 baud
ATC
Serial Baud Rate
The serial rate can be different in different
modules.
C0
115,200 baud
C1
1200 baud
C7
28,800 baud
C2
2400 baud
C8
31,250 baud
C3
4800 baud
C9
38,400 baud
C4
9600 baud (default)
C10
57,600 baud
C5
14,400 baud
C11
76,800 baud
C6
19,200 baud
C12
115,200 baud
AT&Bxx
Character Type (Data bits, Stop bits, Parity). “xx” is formed by adding the values
below. Default is 8 data bits / 1 stop bit / no parity.
0
7 Data Bits
0
No Parity
2
8 Data Bits
4
Zero Parity (Parity bit always zero)
0
1 Stop Bit
8
Odd Parity
1
2 Stop Bits
12
Even Parity
For example, AT&B9 will be 7 data bits, 2 stop bits, odd parity. The character type does
not need to be the same for all modules in a system.
Transparent mode
If you have forced the module to factory default configuration, this configuration will not be
necessary. The following commands can be used to change the configuration to transparent
mode.
AT&M0&L1
Transparent repeater
AT&M1&L1
The repeater will use both a primary group address (AT&G) and a secondary group address
(AT&U). Data will be output to the serial port only when received with the primary group
address.
Controlled mode, auto-connect
Master module
AT&E1&M2&L2
The module will start up in operating mode and will automatically try to connect to the
