Programming manual M238 | 3 MB - BERGER - POSITEC

Serial Line Configuration
Configuring the Manager
To configure a Modbus IOScanner on Serial Line, proceed as follows:
Step Action
1 Select the Configuration tab and double-click the controller.
2 For the TM238LDD24DT and TM238LDA24DR: Click the Communication →
Serial Line entry on the left hand side.
For the TM238LFDC24DT and TM238LFAC24DR : Click the Communication →
Serial Line 1 or Serial Line 2 entry on the left hand side.
3 Click the Protocol Settings entry.
Result: The configuration window is displayed:
Set the parameters as described in the following table:
Element Description
Transmission Mode Specify the transmission mode to use:
RTU: uses binary coding and CRC error-checking (8 data
bits)
ASCII: messages are in a ASCII format, LRC error-checking
(7 data bits)
This parameter must be identical for each Modbus device on the
link.
Response Timeout (ms) Timeout used in the exchanges.
Time between frames (ms) Time to avoid bus-collision.
This parameter must be identical for each Modbus device on the
link.
NOTE: If a configured Modbus slave does not answer correctly to 5 consecutive
requests, this slave is set in an error state in SoMachine and no more requests are
sent to it until the next warm or cold reset.
134 EIO0000000384 04/2012