ENGLISH
Pag. 5
LED
DL1: WD Fault
DL2: TX Data
DL3: RX Data
DL4: RTS
DL5: Power ON
JP4 EOL resistor
If the module is the last of the
bus line, close JP4
Power supply (-V/+V)
RS485 serial line (B/A)
SD1-1 Communication Baud Rate setting:
ON: 115.000 bps
OFF: 9.600 bps
Channels 5-8
Channels 1-4
-V
+V -V
+V
Gas detector connections
Rotary switches for
the module address
1. Introduction
The STG/IN8S remote modules are field mounted and are connected via the RS485 buses
of these panels: Mu+ (all models) and PL4+D. They are used to connect 8 x 4-20mA
analog gas detectors each module. Each module must be addressed using the rotary switch-
es on the PCB. The address must be univocal and between 1 and 255. In any case, please
refer to the control panel manual for the appropriate module using and setting.
2. Module layout
Figure 1) Layout STG/IN8S
3. Addressing
The STG/IN8S modules are addressed using the two rotary switches in RSW 1 and 2 hexa-
decimals. Rotary switches permit hexadecimal settings (base 16). Each switch as 16 positions
(0-F) and the pointer is positioned on the number chosen using a screwdriver to create a
decimal value between 1 and 255 (see table). For the maximum number of modules that can
be connected to the unit refer to the control panel manual.
Each module must have univocal address in the system. Dual addresses are not permitted
even if modules are on different serial buses.
