MM-010019-001, Rev. B
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Both the radio and the control head have two CAN ports to support “daisy-chaining” of multiple control
heads or other CAN devices. Figure 5-2 on page 22 shows the radio’s two CAN port connectors, which
are located on cable side of the I/O cable’s DB-44 connector. Figure 9-3 on page 38 shows the two ports
on the control head’s rear panel.
9.3.2
Make CAN Link Terminations and Cable Connection
Follow this procedure for an installation which has only one control head. For a multi-control head
installation, refer to Figure 9-7 presented in the previous section as necessary.
1.
Connect the CAN Terminator (Item 3 in Table 4-3) onto either one of the two smaller 3-pin
connectors on the rear of the CH-721. This action makes the CAN termination at the control head
end of the CAN link.
When mating any CAN connection (terminators and cables), visually align the
¾-moon-shaped keys of the connectors, and then gently push and turn the outer
locking ring of the plug (male) connector clockwise until it stops. A mild click will be
sensed to confirm proper mating. Without visual alignment as a guide, it is possible
with excessive force to mate the CAN connectors improperly. Damage to the
connector(s) may result. Therefore, visual alignment is recommended when mating
CAN connectors.
2.
Route the CAN Cable (Item 4 in Table 4-3) through the vehicle’s interior wire/cable channeling to the
radio. Remove interior panels, door kick panels, etc., as necessary. Protect the cable from possible
chafing as necessary.
3.
Attach the CAN Cable’s connector to one of the two CAN port connectors on the radio’s I/O cable.
4.
Connect the other end of the CAN Cable to the open CAN port connector at the rear of the control
head.
5.
Connect the CAN Terminator (Item 4 in Table 4-1) onto either one of the two smaller 3-pin
connectors on the radio’s I/O cable. This action makes the CAN termination at the radio end of the
CAN link.
6.
Loop, tie and stow the excess cable as necessary.
9.4 CONTROL HEAD POWER CABLE INSTALLATION
Plan the cable’s route carefully. For the red wire, ensure a route that will not crush or damage the wire in
any way.
9.4.1
Install DC Power Cable and Make Power and Ground Connections
1.
Connect the control head’s DC Power Cable (Item 5 in Table 4-3) to the large 3-pin connector at the
rear of the control head. Visually align the key and gently push and turn the outer locking ring
clockwise until it stops. A click will be sensed to confirm proper mating.
2.
At the back of the control head, form a cable service loop of at least six (6) inches, and tie and stow
the cable as necessary.
3.
Route the cable’s red (positive power) wire through channels in the vehicle to the location of the Fuse
Distribution Rail Assembly near the mobile radio. Remove interior panels, door kick panels, etc.
Protect the wire from possible chafing as necessary.
