n An additional call of the FC/SFC 217 SER_SND causes a return
value in RetVal that includes among others recent information
about the acknowledgement of the partner.
n Further on for USS and Modbus after a SER_SND the acknowl-
edgement telegram must be evaluated by a call of the FC/SFC
218 SER_RCV.
7.3 Deployment of RS485 interface for PtP
The RS485 interface from the CPU is fix set to PtP communication.
Parameterization and communication happens by means of SFCs.
n Logical states represented by voltage differences between the two
cores of a twisted pair cable
n Serial bus connection in two-wire technology using half duplex
mode
n Data communications up to a max. distance of 500m
n Data communication rate up to 115.2kbaud
Overview
Properties RS485
VIPA System 300SDeployment PtP communication
Deployment of RS485 interface for PtP
HB140 | CPU-SC | 312-5BE13 | GB | 15-50 142
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