Verifying The Communications Module Installation; Mj-X Communications Module Cable Routing - Siemens MJ-4 Series Installation Manual

7. Mount the communications module pan cover (if provided) with six 6-32 x 3/8" screws as shown in Figure 5-2.
8. Plug the ribbon connector into J105 on the MJ-X Processor Board as shown in Figure 5-4.
Figure 5-4 MJ-X Communications Module Cable Routing.
9. Feed the PDS cable through the PDS strain relief opening in the rear cover.
10. Reinstall the rear cover of the control panel, attaching it using the six screws.
11. Rotate the PDS strain relief plate to the closed position and tighten the screws for the strain relief plate.
12. Follow the procedure in section 6 to test the communications module.

6 Verifying the Communications Module Installation

Once the MJ-4 Communications Module is installed in the MJ-4 control panel, test the module as follows to ensure
proper operation and performance.
1. Visually inspect the MJ-4 Communications Module for proper mechanical assembly and cable connections.
2. Apply power to the MJ-4 Control Panel and observe the LEDs on the communications module. The Power
LED should light immediately and stay lit. After 10 to 15 seconds, the Watchdog LED should start flashing
without a long pause between flashes, that is, about twice per second.
If this does not occur, check for the following:
The MJ-4 Control Panel is receiving power. Check that the front panel display is active.
The communications module is installed properly. Connections between the MJ-4 and the Communications
Module are correct. Disassemble, inspect, and reassemble the unit as required.
3. After verifying that the communications module is receiving power, perform the diagnostic tests described in
Section 6.1 and 6.2.
10
POWER
W dog
Com m
Connector J105
GND
RTN
Membrane Switch Cable
Txd
Data
Rxd
Rxd
Tx d
CTS
RTS
Processor Board
Connector J411
Power Board