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AXIS 221 - Unit Connectors
I/O terminal connector pinout table
I/O Terminal connector schematic diagram
Example schematic diagram of the AXIS 221 terminal connector - showing possible
applications.
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-
cally isolated from the other internal circuitry.
The maximum load should not exceed 100mA and the maximum voltage should be
not more than 50V DC. Note: Connecting AC to the output will damage the unit.
2Output B
3Digital Input 1
Photocoupler Anode (+)
Photocoupled Input 1. Electrically isolated from the chassis and connectors, this
input can be supplied from an external DC voltage or the DC Power Input/Output on
pins 9 (DC+) and 10 (GND).
4Digital Input 1
Photocoupler Cathode (-)
5Digital Input 2
Photocoupler Anode (+)
Photocoupled Input 2. As above.
6Digital 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.
o
o
Control
Device
o
o
o
o
A
B
3
4
5
6
7
8
External Device
Active
_
+
o
o
1
2
RS-485
Mains Power
24V DC
Appliance
Optional
Relay
Switch
o
o
o
o
o
o
o
o
o
9
10
+
-
Switch, etc.