User's Manual

Chapter Five Specifications
Man_455U Rev 1.0 Page 41
AT&M4 – Configure Modbus specific mode – master
AT&U99 - Set unit address to 99
AT&P0=11-14:1 - To communicate to modbus addresses 11-14, transmit the message
directly to modems 1 through 4 respectively.
AT&P4=25-26:3,5 - Communicate to modbus address 25 and 26, transmit to station 5 via
station 3 and to station 6 via station 3 respectively.
AT&P6=27:3,6,7 - Communicate to modbus address 27 via stations 3,6, and 7.
4.6.2.2 Remote stations 1-4 Configuration
AT&M5 - Configure Modbus specific mode – slave
AT&U1 to AT&U4 - Set the station address 1 to 4
AT&P0=0:99 - Send all messages to station 99.
4.6.2.3 Remote stations 5-6 Configuration
AT&M5 - Configure Modbus specific mode – slave
AT&U5 to AT&U6 - Set the station address 5 or 6
AT&P0=0:3,99 - Send all messages to station 99 via station 3.
4.6.2.4 Remote station 7 Configuration
AT&M5 - Configure Modbus specific mode – slave
AT&U7 - Set the station address 7
AT&P0=0:6,3,99 - Send all messages to station 99 via stations 6 and 3.
4.7.4 DNP3 network with repeaters
The DNP protocol is a peer-to-peer protocol, with both the source and destination address
encoded in the data frame. This example describes a network with 5 stations. Station
addresses are 1-5, with connected DNP devices having addresses 1001 – 1005 respectively.
Stations 1, 2 and 4 can communcate to station 3. Station 4 can also communicate to station 5.
This example also applies to Profibus networks, except that the mode setting (&M) will have
a different value.
4.6.3.1 Stations 1&2 configuration
AT&M8 - Configure DNP3 protocol mode
AT&U1 or AT&U2 - Set station address to 1 or 2.
AT&P0=1002:3,2 - To talk to 1002, communicate via 3 and station 2 (For station 1)
AT&P0=1001:3,1 - To talk to 1001, communicate via 3 and station 1 (For station 2)
AT&P1=1003:3 - To talk to 1003, go via station 3
AT&P2=1004:3,4 - To talk to 1004, go via station 3 then 4
AT&P3=1005:3,4,5 - To talk to 1005, go via station 3, 4 then 5
4.6.3.2 Station 3 configuration