Onlogic K800, Product Manual

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2.2 - DIO, CAN, Ext. Power Switch
The Karbon 800 series 20-Pin header provides the following interfaces: 8-bit (4-in, 4-out) Digital Input
Output (DIO) or General Purpose Input Output (GPIO) with optically isolated terminals, one CAN bus
connection, and an optional external power switch connection.
The DIO is optically isolated, meaning that the terminal is separated from other motherboard features
for protection. The DIO terminal requires external power from a
5~48V DC source through Pin 20 with
GND to Pin 19 in order to function.
The Isolated Power Supply (ISO PSU) can be a voltage source from 5~48V to interface with external
digital IO. The maximum power draw from the supply should not exceed 0.6A under normal operating
conditions. Individual DOut pins will be damaged by loads in excess of 150mA. The ISO PSU must be
a DC Limited Power Source (LPS) power supply.
Mating power switch cables should be a twisted-pair wire with floating shield to assure proper
immunity to EMI/RFI. It is recommended to keep wires at less than 3 meters in length. Any remote
power switch connected between pins 1 and 2 should be momentary contact type only.
Pin Definition Pin Definition
1 SW+ 2 GND
3 GND 4 GND
5 GND 6 CANH
7 GND 8 CANL
9 GND 10 GND
11 In0 12 Out0
13 In1 14 Out1
15 In2 16 Out2
17 In3 18 Out3
19 V_DIO- 20 V_DIO+
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