SAIA PCD2 Central processing units PCD2.M110

Manufacturer: SAIA
Type: Central processing units
Model: PCD2.M110
Part No: PCD2

Symptom
When the communication driver “PCD driver” is used in a PCD8.D81w project, the communication works on the PGU Port (port 0) of a PCD2.M110 (or a PCD2.M120) but not on the following systems: PCS1, PCD2.M150/M170/M480/M5xx0 or on a PCD3.

Reason
The PGU mode of recent PCD systems is no longer based on the P800 communication protocol (which uses the obsolete communication protocol “Mode D”). The recent PCD2 and the PCD3 use S-Bus on Port 0, and the PCD driver on the terminal uses P800 protocol. Because the PCD7.D7xx terminals use the P800 protocol if the “PCD driver” is selected, the communication does not work on systems developed after the PCD2.M110/M120.