MM-007024-001
35
2.
The Control Head can be positioned at various angles for best display viewing. As necessary, turn it
on the thumbscrews to a good position (typically, as viewed from the driver’s seat) and then tighten
both thumbscrews until the Control Head is held firmly in place.
9.4 CAN
CONNECTIONS
9.4.1 General
Information
Because CAN devices do not provide their own termination, the CAN bus needs to be terminated at both
ends for proper operation.
The CH-103 Control Head has two ports on the rear panel to support “daisy-chaining” of multiple Control
Heads or other CAN devices. When a CH-103 is in the middle of a chain (e.g., radio on one end and
another Control Head on the other), two separate CAN cables connect to the two ports. When the CH-103
is at the end of a chain of devices, one CAN port connects to the previous CAN device and the other port
needs to be terminated with a CAN Terminator (part number MACDOS0010).
The CH-103PA Control Head has only one CAN port. A CAN Y-cable (part number MACDOS0017-
BR010 for right-angle connector or MACDOS0017-BN010 for straight connector; listed in Table 4-4)
needs to be connected to the rear of the CH-103PA to properly terminate the CAN chain. If the
CH-103PA is in the middle of a chain of CAN devices, one CAN cable will connect to one leg of the
Y-cable and another CAN cable will connect to the other. When the CH-103PA is the only CAN device
or is at the end of a chain of devices, one leg of the Y-cable goes to the previous CAN device and the
other needs to be terminated with the CAN Terminator provided in the Control Head Installation Kit.
The radio has two CAN port connections on its I/O pigtail cable. Like the Control Head, it can be
connected either at an end or in the middle of a CAN chain. However, for logistical purposes, it typically
is an end point and provides a termination when a CAN Terminator is connected to one of the two CAN
connectors. The CAN cable from a Control Head then connects to the other connector.
9.4.2
Make CAN Termination
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. Per the specific Control
Head being installed, follow the respective procedure in one of the following subsections.
NOTE
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.
9.4.2.1
CH-103 Control Head CAN Termination
Connect the CAN Terminator (Item 3 in Table 4-3) onto one of the two smaller 3-pin connectors on the
rear of the CH-103. This makes the CAN termination at the Control Head end of the CAN chain.
Continue with section 9.4.3.