Axis Communications AXIS 221 user manual Terminal connector pinout table

AXIS 221 - Unit Connectors 47

I/O terminal connector pinout table

Pin	Function	Description
1	Output A	On the external device output terminals (A and B), there is no distinction between
		positive and negative (+ and -). The terminals use a photocoupler and are electri-
2	Output B
		cally isolated from the other internal circuitry.
		The maximum load should not exceed 100mA and the maximum voltage should be
		not more than 50VDC or 35VAC.
3	Digital Input 1	Photocoupled Input 1. Electrically isolated from the chassis and connectors, this
	Photocoupler Anode (+)	input can be supplied from an external DC voltage or the DC Power Input/Output on
		pins 9 (DC+) and 10 (GND).
4	Digital Input 1
	Photocoupler Cathode (-)
5	Digital Input 2	Photocoupled Input 2. As above.
	Photocoupler Anode (+)
6	Digital Input 2
	Photocoupler Cathode (-)
7	RS-485-A (non-inverting)	A half-duplex RS-485 interface for controlling auxiliary equipment.
8	RS-485-B (inverting)
9	DC + Power Output	This can drive the photocoupler inputs or other equipment. The output voltage level
		is 3.0 V. A maximum current of 100mA can be sourced from the DC output.
10	GND	Ground.

I/O Terminal connector schematic diagram

Example schematic diagram of the AXIS 221 terminal connector - showing possible applications.

o 1

o 2

o 3

	Optional
			o
		Relay		Appliance	o
	Switch		o
				o o
o o
24V DC				Mains Power
o o
Switch, etc.

				o						4
					o				5
						o		6
	A
			o									7
RS-485		o									8
	B												9
							+
							-10

+

Active

Control _ Device

External Device