Hardware manual PCD7.LRxx-PG5 room controller │ Document 27-653; version ENG07 │ 2019-03-21
Saia-Burgess Controls AG
Communication
5
5-14
Modbus on PCD7.LRxx-P5 RS-485 interfaces
5.4
Modbus on PCD7.LRxx-P5 RS-485 interfaces
Supported Modbus protocol
Modbus/RTU
Supported Modbus functionality
Modbus client and Modbus server
*
Supported baud rates
1.2 kbps, 2.4 kbps, 4.8 kbps, 9.6 kbps, 19.2 kbps, 38.4 kbps,
57.6 kbps, 115.2 kbps
Supported data formats
(Bits-Parity-Stop)
8-N-1
8-O-1
8-E-1
8-N-2
8-O-2
8-E-2
Supported IRM ports
Port 0 and 1
Possible to use at the same time
- one port as Modbus client and the other as Modbus server
- both ports as Modbus client
- both ports as Modbus server
Supported Modbus functions
Function Code Description
1
Read Coils
3
Read Multiple Holding Registers
15
Write Multiple Coils
16
Write Multiple Holding Registers
Access with Modbus to
PCD7.LRxx-P5 media
All registers and flags
* 7 data bit mode is not supported.
5.4.1 Limitations
● Only default mapping from PCD registers/flags to Modbus holding registers/
coils is supported, user-specific mapping is NOT implemented. The FBoxes
‘Define Mapping Binary/Float/Integer’ are not supported.
● Access to all PCD registers/flags over Modbus, not possible to prevent access
over Modbus to individual registers or flags
●
Access to other media like timer/counter/DB/text is not possible.
● Only one “Def Unit Server” FBox can be placed.
● For the Def Unit Server FBox, only the FIX UID is supported; the offset, 32-bit
swap, 32-bit holes and active default mapping are NOT implemented.