User manual

805U Radio Modem Module User Manual
Page 54 © April 2011
AT&K Flow Control Configuration.
&K0 Flow Control Disabled. CTS Always high. Module ignores RTS.
&K1 not used
&K2 not used
&K3 CTS/RTS Flow Control. CTS Reflects the state of the local buffer. Module only
transmits serial data when RTS is high.
&K4•
RS-485 Control. Must be selected for RS-485 to work. CTS is high. CTS goes
low when transmitting data. RTS is ignored.
AT&L Configuration of start-up mode, and controlled mode operation.
&L0 At power-up, the module enters command mode and waits for commands. Normal
single-connect controlled mode operation.
&L1•
If set to transparent mode in AT&M, the module automatically goes online. For
controlled mode, ATD automatically dials the number stored in Z0, ATA answers
an incoming call.
&L2 Auto-connect mode - master. The module “dials” the number stored in &Z0
automatically. It continuously attempts to connect to that number. Use DTR with
the AT&D command to control the connection.
&L3 Auto-connect mode - slave. The module continuously attempts to answer any
incoming call. Use DTR with the AT&D command to control the connection.
AT&M Operating Mode. This allows selection between transparent mode and controlled
mode.
&M0•
Transparent Mode.
&M1 Transparent Repeater. All serial data is sent out the radio, with the configured
system (AT&S) and group (AT&G) address. All incoming radio data with the
correct system address and matching group address is sent out the serial port, and
also re-transmitted out the radio port using the unit address (AT&U) setting as the
group address. All incoming radio data with the configured system address and
group address matching the Unit address is re-transmitted out the radio with the
group address set to the group address.
&M2 Controlled Mode.
&M3 Not used.
AT&N Abort Connection Control. Controls whether the module will abort a connection
attempt in controlled mode if a character is entered.
&N0 Ignore characters entered while attempting to make a connection.
&N1•
If a key is hit or a character input while attempting to connect, abort the
connection attempt and return to command mode.
AT&S Set module’s System Address Range 0-255.
AT&T Self Tests. Allows in-field diagnostics, and factory testing.
&T0 Transmit Bit Error Rate Test. Generates pseudo random data and sends out radio.