Hardware manual PCD7.LRxx-PG5 room controller │ Document 27-653; version ENG07 │ 2019-03-21
Saia-Burgess Controls AG
Communication
5
5-8
RS-485 interfaces (ports 0 + 1) in general
5.3.5
RS-485 interface port 1
Port 1 is recommended, among other things, as an I/O extension and a connection
for room operating devices.
5.3.5.1
Sample system architecture for I/O extension
A second RS-485 interface can be used to connect E-Line RIO modules for I/O
extension for HVAC, light or shade control. This makes it possible to create cross-
plant room automation functions and thus attain the highest possible class of ener-
gy efficiency in accordance with DIN EN 15232, significantly reducing energy costs
while at the same time ensuring a high degree of comfort.
EasyClick
S-Bus/Modbus
PCD7.D1000
Sylk-Bus
S-Bus/Modbus
Ethernet
5.3.5.2
Limitations for I/O extension with E-Line modules
No more than 10 S-Bus slaves or 10 Modbus slaves, such as E-Line modules,
can be connected via the second RS-485 interface of the PCD7.LRxx-P5 room
controller.
The following points must be observed in order to determine the feasible amount
of S-Bus/Modbus slaves:
●
Bus cycle time => use only for HVAC, lighting or blinds
●
Application program resource requirement:
The more E-Line modules connected to the second RS-485 interface of the
PCD7.LRxx-P5, the less memory space there is for the application program.
