CHAPTER 4
–
DATA COMMUNICATIONS INTERFACE
28
MultiLoad II/ RCU II Explosion Proof Lite (EXL) Installation Guide - Part # 6070
Host/TMS Communications
A host/ TMS computer system can be connected to the MultiLoad II/ RCU II in various ways :
-
RS485 4-wire on COM 1
-
RS485 2-wire on COM1
-
RS232 on COM1
-
Ethernet on the ethernet port
4.2.2.1
COM 1 - RS-485 4-wire - Host/TMS Communications
A host/ TMS computer system can be connected to the MultiLoad II/ RCU II via RS485 4-wire on
COM 1.
The TD and RD pairs are swapped at the Host/TMS.
Figure 4.2
RS485 4-Wire, Host to a Single MultiLoad II/ RCU II (recommended)
MultiLoad II/RCUII can be multridropped on the same communication line using a RS485
– 4 Wire
on COM 1 to communicate to a host system.
Figure 4.3
RS485 4-Wire, Host to Multiple MultiLoad II/ RCU IIs
TDA
TDB
RDA
RDB
RDA
RDB
TDA
TDB
Host/TMS
RS485
TDA
TDB
RDA
RDB
RDA
RDB
TDA
TDB
RDA
RDB
TDA
TDB
MultiLoad II/
RCU II #1 COM 1
Host/TMS
RS485
MultiLoad II/ RCU
II #n COM 1
MultiLoad II/ RCU
II COM 1