MR MESSKO MTRAB - Modbus Settings

6 Electrical connection
70 BA6820378-03 EN
6.9.5 Modbus settings
Figure49: RS485 settings
Half-duplex or full-duplex operation
To set the MESSKO
®
MTRAB
®
for half-duplex operation, proceed as follows:
► Set the "Duplex mode" switch to the "HALF" position.
To set the MESSKO
®
MTRAB
®
for full-duplex operation, proceed as follows:
► Set the "Duplex mode" switch to the "FULL" position.
Half-duplex operation terminating resistor
If the MESSKO
®
MTRAB
®
in half-duplex operation is the last device in the
bus system, the device is to be terminated with a 120-ohm resistor. To do
so, proceed as follows:
► Set the left-hand switch on "BUS termination 120Ohm" to the "ON" po-
sition.
Full-duplex operation terminating resistors
If the MESSKO
®
MTRAB
®
in full-duplex operation is the last device in the
bus system, the device is to be terminated with two 120-ohm resistors. To do
so, proceed as follows:
► Set both switches on "BUS termination 120Ohm" to the "ON" position.