1
INST.No. INE-359
GT120 series
Digital Indicating Controller
COMMUNICATIONS INTERFACES
Instruction Manual
To prevent accidents arising from the misuse of this controller, please ensure the operator using it receives
this manual.
Warning
Turn the power supply to the instrument off before wiring or checking it.
Working or touching the terminal with the power switched on may result in severe injury
or death due to Electric Shock.
1. System configuration
RS-485 multi-drop connection communication (Option)
(Fig.
1-1)
(Fig.
1-2)
2. Wiring connection
When using line converter (SC8-10)
• Connector: D sub 25-pin
Connection: RS-232C RS-485 (Communication speed: 2400, 4800, 9600, 19200bps)
(Fig. 2-1)
Host computer
GT120
No.0
No.1
No.30
GT8-CDD
GT8-CDM
Shield wire
SD
2
RD
3
SG
7
FG
1
RS
4
CS
5
DR
6
ER
20
CD
8
Host
computer
D-sub connector 25-pin
4
3
RS-232C
RS-485
SC8-10
RDA(+)
5
RDB(-)
6
SD
2
SG
3
RD
1
built-in terminator
RS-485
No.0
GT120
No.1
GT120
No.2
GT120
No.30
GT120
Host computer
RS-485
Host computer
RS-232C
Line converter
232C 485
SC8-10
No.30
GT120
No.0
GT120
No.1
GT120
