User's Manual

455U Radio Modem Module User Manual

Page 54 © November 2004

In this mode, Messages on the RS-485 port are sent the the address configured in

the command line, or configured in the auto-dial register &Z0.

&M1 Acknowledged mode. This mode simulates telephone modems, with a single

connection being made to a remote modem in the system, and each message is

acknowledged before more data is sent. If no Acknowledgement is received, the

message is re-transmitted.

&M3

&M4

etc

Host protocol specific modes.

AT&N Abort Connection Control. Controls whether the modem will abort a connection

attempt if a character is entered. This item is only meaningful with the

acknowledged mode of operation.

&N0 Ignore characters entered while attempting to make a connection.

&N1•

If a key is hit while attempting to connect, abort the connection attempt and

return to command mode.

AT&P Protocol Routing Paths – Up to 100 paths can be stored. Routing paths are used

in conjunction with host protocol specific routing, so that device addresses may

be extracted from the data frame and used to direct the message. Each path

consists of a destination address extracted from the protocol frame, a radio

destination address and up to 6 store and forward addresses.

Format:

1. “AT&Pxx= a[-a]:{n,}f”.

“xx” = 0 to 99. “a” = 0 to 65535 (depending on protocol). “n” = 0 to 127,

“f” = 0 to 255. This indicates the path to send the message. “a” is the

protocol address to match. (“a-a” indicates a range of addresses) “n”

indicates a repeater address in the radio network, and “f” indicates the

final address (0-127 indicates RS232 port, 128-255 indicates RS485 port)

2. “AT&Px=” “x” = 0 to 99. Clear path number “x”

3. “AT&Px?”. “x” = 0 to 99. Display setting for Path “x”

4. “AT&P?” or “AT&P” – Display all configured paths

5. “AT&P=” Clear all paths

These paths may apply to either the RS-232 port or the RS-485 port depending

on the modem’s operating mode

AT&R Repeater Functionality– Enable or disable repeating of messages to the wildcard

addresses 0 and 128, and enable or disable sending messages to serial port.

&R0•

Don’t repeat messages to the “Wildcard” address, and don’t copy repeated

messages out the local serial port..

&R1 Repeat Messages sent to the wildcard address.

&R2 Send A copy of repeated messages out the serial port (RS-232 or RS-485 port