Mounting The Communications Module; Setting The Communications Module Jumpers; Fiber Optic Version; Figure 4-2 Communicationsm - Siemens MJ-XL Installation Manual

4.2 Mounting the Communications Module

Hold the communications module in place over the five standoffs on the main PCB and insert the 24-pin connector
on the ribbon cable into the 24-pin connector (P8) on the main PCB. If you are installing the RS-232/485 version,
insert the 6-pin power-cable connector into P9 on the main PCB. See Figure 4-2 below. Mount the communications
module on the threaded standoffs on the main PCB using the five screws provided.
MJ-XL Main PCB

4.3 Setting the Communications Module Jumpers

Prior to installing the communication module into the MJ-X Control Panel, ensure that the jumpers are properly
installed on the printed circuit board. Jumper selections for the Fiber Optic version and RS232/485 version are
described in separate sections below.

4.3.1 Fiber Optic Version

The jumper locations on the fiber optic version are shown in Figure 4-3. The view of the module is from the
component side. The fiber optic receiver (RX) and transmitter (TX) are shown for reference. The jumper settings
are listed in Table 4-1.
Set Auto Repeat to no repeat when only one unit is installed in the network.
6
P8
24-Pin Connector
Figure 4-2 Communications Module Installation
1
J14
2
3
Figure 4-3 Fiber Optic Version Jumper Locations
6-32 x 3/8" Screw (5)
Ribbon Cable with 24-Pin Connector
Comm Mod PCB
Power Cable
(RS-232/485 only)
P9
J10
J11
2
J12
1