User manual

905U-D Radio Modem User Manual
Man_905D_1.10.doc Page 42
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
destination address saved in AT&Z0 (this is the slave unit). The destination address needs to be
entered - for example,
AT&Z0=24 will store a destination address of 24
AT&Z0=33,34,35,5 will store an address sequence, where 5 is the destination address and 33,
34 and 35 are repeater addresses. The first repeater will be 33.
The 905U-D master will attempt to connect to the destination address (slave). If the module
cannot connect, or if communications fails, the module will continually send “connect”
messages to make a connection.
Slave module AT&E1&M2&L3
The module will start up in operating mode and will automatically accept any connect message
addressed to it.
Low Power Mode
Low power mode is normally used with auto-connect controlled mode, although it can also be
used with other controlled modes. Before you configure the unit for auto-connect controlled
mode, enter
AT&D3
This allows the DTR signal on the RS232 port to control the module. When the host resets
(signal low) the DTR signal, the module will disconnect the radio link, and the module will
revert to low power mode - the module will switch off its radio receiver and microprocessor.
When the host activates the DTR signal, the module will start up and attempt to connect to its
slave address.
Controlled mode, single-connect
AT&E1 &M2&L0 (both master and slave module)