User manual

805U Radio Modem Module User Manual

Page 42 © April 2011

4.6 Configuration Examples

Transparent Mode

Extending a PLC Network

Left-hand Unit Configuration

Set the module to factory default settings: AT&F

Set the system address to a random number: AT&S138

Set the group address AT&G1

The group address for the left hand side modules has been set to 1.

Set the serial data rate to 38400 ATC6

Set the radio data rate to 19200 not necessary (default)

Set the character type to 7,1,2,even AT&B13

Exit and save the configuration AT&W ATO

The operating mode will already be in transparent mode from the factory default settings.

The other default values for the other parameters will likely be OK.

Repeater Configuration

Set the module to factory default settings: AT&F

Set the system address to the same random number: AT&S138

Set the group address and unit (secondary group) address AT&G1 AT&U2

The group address for the right hand side module will be set to 2 (this corresponds to the

secondary address of the repeater).

Note that the repeater will only output data to its PLC for messages received from the first 805U. It

will not output data from the right-hand PLC. If you set both group addresses to 1, then the repeater

will output data from both sides - this is only possible when there is only one repeater. The

disadvantage of this is that both sides will hear the re-transmitted message - that is, the PLC that

sent the message will receive the same message back as a re-transmitted message. This is not a

problem with most PLC’s, but is with a small number of brands. For these brands, use a different

group address either side of the repeater.

PLC

RS485

38.4KB

805U

19.2KB

805U

PLC

RS485

9.6KB

REPEATER

DATA = 7 DATA BITS, 1 START, 2 STOP, EVEN PARITY

PLC

RS485

9.6KB