Manual

MAN0890-02-EN CH. 5
August 20, 2009 Page 23 of 96 ECN # 979
CHAPTER 5: CAN COMMUNICATIONS
Note: See the latest edition of Horner’s CAN Networks Manual (MAN0799) by referring to our website
(
http://www.heapg.com).
5.1 Overview
QX751 models with either a BP41 or BP43 attached provide a CAN networking port, which is
implemented with a 5-pin connector, labeled CsCAN.
Like the MJ1 serial port, the CsCAN port can be used for QX751/BPxx programming by connecting it to
the CAN port of a PC running Cscape. The CsCAN port also allows the QX751/BPxx to exchange global
data with other OCS/RCS controllers and to access remote Network I/O devices (SmartStix Modules).
5.2 Port Description
The QX751/BPxx CsCAN port implements the ISO 11898-2 physical layer and the CAN 2.0A data link
layer standards. Also, since the CsCAN port is powered by an internal isolated power supply, external
CAN power is not required.
5.3 Wiring
This section shows how the CsCAN port pins are assigned.
Figure 5.1 – CsCAN Port Connector
Table 5.1 – CsCAN Port Pin Assignments
Pin Signal Signal Description Direction
1 V- CAN Ground
−
2 CN_L CAN Data Low In/Out
3 SHLD Shield Ground
−
4 CN_H CAN Data High In/Out
5 NC No Connect
−
Note: The V+ connection is
not
required on the
QX751BPxx. The
QX751BPxx network port is
self-powered. However,
supporting devices can
require this connection, and
this pin can be used to land
the extra wire required for
those devices.