Gas Detection (Australia) Pty Ltd Page 14 of 44
M-GDA-3000 Rev 1
5.3. Main PCB terminal description and wiring method
If you remove the Display Part, there is the Terminal Block under the Main PCB as shown in
the following Figure 6. The Terminal Block can be removed from Main PCB by holding and
pulling upward by hand. Unscrew the 5 terminal set screws above the separated
Terminal
Block CN12 (VIS, +, mA, -, ETH) Connector
counter-
clockwise with a Θ screwdriver; connect
DC18-24V power to +, -; connect Signal Cable to mA; tighten the terminal set screws
clockwise to keep the terminals in place; and insert it like before the removal.
[Figure 6. CN12 Terminal structure]
No.
PCB Silk
Pin
Name
Description
4~20mA Source Drive
(J1 Jumper ON)
4~20mA Sink Drive
(J1 Jumper OFF)
1
VISO
VIS
N.C
4~20mA Sink In(+)
2
+24V
+
+24V / POWER (+)
3
mA
mA
4~20mA Source Out
4~20mA Sink Out(-)
4
GND
-
GND / POWER (-)
5
ETH
ET
EARTH
[Table 6. CN12 connector description ]
Note 1) Be sure to use CVVS or CVVSB 2.0sq↑ Shield Cable before Terminal construction.
Note 2) Fasten Terminals based on +24V of 2Pin to connect the 4Pin Terminal of existing
conventional GDA3000.