4.2.3.2 Com 1 - Rs-485 2-Wire - Host/Tms Communications; Figure 4.6 Rs485 2-Wire, Host To A Single Multiload Iii/Rcu Iii Ex Hardware Unit; Figure 4.7 Rs485 4-Wire, Host To Multiple Multiload Iii/Rcu Iii Ex Hardware Units - Toptech MultiLoad III Installation Manual

CHAPTER 4– DATA COMMUNICATIONS INTERFACE

4.2.3.2 COM 1 - RS-485 2-wire - Host/TMS Communications

The Host/TMS Computer System can be connected to the MultiLoad III/RCU III EX Hardware via
RS485 2-Wire on COM 1.
The TD and RD pairs tied together at the Host/TMS and all MultiLoad III/RCU III EX Hardware
units.
Host/TMS
RS485
TDA
TDB
RDA
RDB
Figure 4.6
A MultILoad III/RCU III EX Hardware unit can be multidropped on the same communication line
using RS485 – 2 Wire on COM 1:
Host/TMS
RS485
TDA
TDB
RDA
RDB
Figure 4.7
34
MultiLoad III/RCU III Hardware - Explosion Proof (EX) Installation Guide
RS485 2-Wire, Host to a Single MultiLoad III/RCU III EX Hardware Unit
MultiLoad III/RCU III HW
RS485 4-Wire, Host to Multiple MultiLoad III/RCU III EX Hardware Units
MultiLoad III/ RCU III
COM 1
RDA
RDB
TDA
TDB
#1 COM
RDA
RDB
TDA
TDB
MultiLoad III/RCU III HW
#n COM 1
RDA
RDB
TDA
TDB