Rockwell Automation 57C329 Remote I/O Communications, AutoMax - Manual (Page 138)

KĆ20
Step 3. The received signal duty cycle should be 50%. If it is not,
then use the potentiometer on the transceiver to adjust it.
The potentiometer is located between the two fiberĆoptic
connectors as shown in figure K3.1. Remove the snapĆin
button to access and adjust the potentiometer.
FiberĆOptic
SnapĆIn
RT
Transceiver
Button
Connectors
Figure K3.1 Ć Potentiometer Location