Axis Communications 2 user manual Appendix D Unit Connections, D-Sub Connector, Terminal Block

AXIS 230 Unit Connections 49

Appendix D - Unit Connections

The D-Sub Connector

The AXIS 230 provides one 9-pin D-sub connector, providing the physical interface for an RS-232 port, used for connecting accessory equipment; such as stand-alone Pan/Tilt devices for the remote positioning of connected video cameras.

A diagram of the RS-232 connector, complete with pin assignment table, is shown below.

Pin	Function
1	CD
2	- RXD
3	- TXD
4	DTR	1	2	3	4	5
5	GND		6	7	8	9
6	DSR
7	RTS
8	CTS
9	RI

The Terminal Block

The terminal block is located on the rear panel and provides the interface to a single transistor output, two digital inputs, an RS-485 interface and GND.

This section describes the pinout, interface support and the control and monitoring functions provided by the terminal block.

Terminal Block Pinout

Pin	Function	Description
1	GND
2	Digital Input 1	1k internal pull-up. Connect to GND to activate.
3	Digital Input 2	1k internal pull-up. Connect to GND to activate.
4	Digital output	Maximum current sink of 100mA (via logical 0 output.) Handles a maximum voltage of
		24V DC, which is grounded at a maximum of 100mA. This output has an open-collec-
		tor NPN transistor with the emitter connected to pin 1. If used with an external relay,
		a diode must be connected in parallel with the load, for protection against voltage
		transients.
5	RS-485-A (non-inverting)	A half-duplex RS-485/422 interface for controlling auxiliary equipment.
6	RS-485-A (inverting)