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Digital I/O Specifications; Controller Area Network Bus Features - Cisco Catalyst IR1800 Rugged Series Hardware Installation Manual

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Digital I/O, Ignition, and CAN Bus Connectivity

Digital I/O Specifications

Digital I/O specifications are described in the following tables.
Table 26: Digital Input Specifications
Specification
Minimum
Input Voltage High
2.2
Input Voltage Low
—
Input Current
—
Note
Current is flowing out of the terminal although it is an input, that is, sourcing. The current is flowing in the
terminal for the output, that is, sinking.
Table 27: Digital Output Specifications
Specification
Output Voltage High
Output Voltage Low
Internal Pull-Up Resistance
Internal Pull-Up Voltage
External Pull-Up Voltage
Sink Current

Controller Area Network Bus Features

The IR1800 features support for the Controller Area Network (CAN) Bus interface through two wires that
connect to the OBD-II connector of the vehicle.
The following are some of the characteristics of the CAN Bus:
• CAN Bus enables the ECU (electronic control unit) in a vehicle to communicate with all other ECUs
• Consists of two wires: CAN Bus High and Low, supporting data rate up to 1 Mbs
• High-speed CAN Bus 2.0B: ISO 11898-1 data link layer, ISO 11898-2 and ISO-11898-5 physical layer
• Maximum cable length between 500 m (125 kbit/s) and 40 m (1 Mbit/s)
• 120-ohms CAN Bus termination
Maximum
Unit
60
Volts
1.2
Volts
0.68mA
mA
Minimum
Maximum
Unit
2.5
—
Volts
—
0.4
Volts
1K – 1%
1K – 1%
Ohms
—
3
Volts
3.3
60
Volts
—
200
mA
up to 1 Mbs data rate (software dependent)
Notes
No external voltage applied.
No external voltage applied.
—
—
External resistance required to limit current to 200mA.
—
Cisco Catalyst IR1800 Rugged Series Router Hardware Installation Guide
Digital I/O Specifications
75
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