Can Bus Power Connector; On-Board Diagnostic (Obd-Ii) - Cisco Catalyst IR1800 Rugged Series Hardware Installation Manual

Can Bus Power Connector

• There is no hardware mechanism to detect if an ODB II connector is attached
Can Bus Power Connector
The CAN_P and CAN_N signals are connected to two pins of the 4-pin mini-fit power connector. A cable
can be connected from the mini-fit connector to the OBD-II connector of the vehicle to get both unswitched
power and CAN interface input.
The pinouts are shown in the following figure.
Figure 30: Power Connector
Table 28: Power Connector Descriptions
Pin Number Name Description
1 DC - DC Power Return (GND-)
2 CAN_P CAN Bus Differential Signal
3 DC + DC Power Input (12V, 24V)
4 CAN_N CAN Bus Differential Signal

On-Board Diagnostic (OBD-II)

The following are some of the characteristics of On-Board Diagnostic (OBD-II):
• OBD or OBDI standardizes the connector so that it is identical in all the vehicles
• The communication protocol remains somewhat specific depending on the make of the vehicle
• The OBDII port is always powered up, even when the vehicle is turned off
• When connecting an IR1800 CAN Bus, the vehicles owner must review the characteristics of the ODB2
Cisco Catalyst IR1800 Rugged Series Router Hardware Installation Guide
76
power and fuse protection
Digital I/O, Ignition, and CAN Bus Connectivity