Serial Host/Tms Communications; Com 1 - Rs-485 4-Wire - Host/Tms Communications; Figure 4.4 Rs485 4-Wire, Host To A Single Multiload Iii/Rcu Iii Ex Hardware (Recommended); Figure 4.5 Rs485 4-Wire, Host To Multiple Multiload Iii/Rcu Iii Ex Hardware Units - Toptech MultiLoad III Installation Manual

CHAPTER 4– DATA COMMUNICATIONS INTERFACE

Serial Host/TMS Communications

A host/ TMS computer system can be connected to the MultiLoad III/ RCU III EX Hardware in
various ways:
- RS485 4-wire on COM 1
- RS485 2-wire on COM 1
- RS232 on COM1
- Ethernet on Ethernet Port #1
4.2.3.1

COM 1 - RS-485 4-wire - Host/TMS Communications

A host/ TMS computer system can be connected to the MultiLoad III/RCU III EX Hardware via
RS485 4-wire on COM 1.
The TD and RD pairs are swapped at the Host/TMS.
Host/TMS
Figure 4.4 RS485 4-Wire, Host to a Single MultiLoad III/RCU III EX Hardware (recommended)
MultiLoad III/RCU III EX Hardware can be multridropped on the same communication line using a
RS485 – 4 Wire on COM 1 to communicate to a host system.
Host/TMS
RS485
TDA
TDB
RDA
RDB
Figure 4.5
33
MultiLoad III/RCU III Hardware - Explosion Proof (EX) Installation Guide
RS485
TDA
TDB
RDA
RDB
MultiLoad III/ RCU III
RS485 4-Wire, Host to Multiple MultiLoad III/RCU III EX Hardware Units
MultiLoad III/ RCU III
#1 COM 1
RDA
RDB
TDA
TDB
COM 1
RDA
RDB
TDA
TDB
MultiLoad III/ RCU III #n
COM 1
RDA
RDB
TDA
TDB