saia-pcd.com
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1
SBC software
3
SBC S-Web technology
2
Communication &
Interaction
Communication & Interaction
4
Room automation
The S-Bus protocol can be used on the USB and serial interfaces for communicating with Saia PCD® controllers. This makes it possible
to construct very simple, economical communication links and networks. Point-to-point (USB, RS-232) and 1:n communication relation-
ships are supported in the RS-485 network in the master-slave operation.
S-Bus supports communication between
PCD controllers in the master-slave (1:n) operation
a PCD controller and the PG5 programming device
PCD control and OPC server or SCADA system with S-Bus drivers
a PCD controller (PCDWebServer) and web browser with Web Connect software
Point-to-point communication relationship with S-Bus
S-Bus with
USB (host only with PC), RS-232, RS-422, RS-485
1 slave station
Properties, functions
Interfaces: USB, RS-232, RS-422, RS-485 (can be used simultaneously on several interfaces)
Baud rate: up to 12 MBit/s (USB standard 1.1)
Communication relationship: Master-slave
Exchange of data with a SCADA system with the SBC OPC server or an S-Bus driver
Supports communication via modem (PSTN, ISDN, GSM) to RS-232 interface
1:n master-slave communication relationships in the RS
-
485 network with S-Bus
1 master station
Properties, functions
Interfaces: RS-485 (can be used simultaneously on several interfaces)
Baud rate: up to 115 kBit/s
Bus cable: 2-wire, twisted and shielded (min. 2 × 0.5 mm2)
Bus length: max. 1200 m per segment
Number of stations: max. 32 per segment, total max. 255
Number of segments: max. 8, connected to each other via RS-485
Communication relationship: Master-slave (only 1 master)
Programming the data transfer between PCD controllers with FBoxes for cyclic or event-controlled data transfer
Exchange of data with a SCADA system along with the SBC OPC server or an S-Bus driver
Note
The S-Bus protocol is also suitable for constructing multi-point wireless networks with external wireless modems. The wireless modems
are connected to the RS-232 interface. The control cables can be used to control the wireless modem transmitters. Further information
on this is contained in reference manual 26-739.
The proprietary S-Bus is designed for communicating with the Saia PG5® engineering tool, connecting to the management level/pro-
cess control systems and for PCD
↔
PCD communication. It is not suitable or approved for connecting the field devices of other manu-
facturers. An open, manufacturer-independent field bus (e.g. Profibus, Modbus, etc.) is the correct solution for this.
PG5, SCADA,
OPC,
Web browser
1 master station
S-Bus with RS-485
n
slave stations
PG5, SCADA,
OPC,
Web browser
2.5.3
Serial S-Net: S-Bus on USB and serial interfaces, RS-232, RS-422/485
