Wiring For Rs-485 (Option) - Toho Electronics TRM20A Operation Manual

4.7 Wiring for RS-485 (Option)

RS-485 terminal
［ ］
RS-485 terminal is "Terminal No. 58
It wires for the cable according to the figure below.
The terminator for RS-485 (Rt=200Ω) is sold as an option article (Code: WMSU0303A01).
※
CAUTION
Please put terminator (Rt=200Ω) on the host side. In view of the host, please install terminator
●
(Rt=200Ω) in TRM20A in the distance most.
The connection is 32 or less including the host computer.
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The length of the cable is 1.2km or less.
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The use of "UL20620-SB(M)(Hitachi-densen corporation)" equivalent goods cable is
●
recommended.
59".
～
58 59
+ -
Rt
＋
TRM20A
4-8
Host computer
R
－
－
＋
TRM20A
...
－
＋