Appendix E - Unit Connections; The D-Sub Connector; The I/O Terminal Blocks - Axis 250S User Manual

Unit Connections
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Appendix E - Unit Connections

The D-Sub Connector

The AXIS 250S 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
1
2
3
4
5
6
7
8
9

The I/O Terminal Blocks

The two 4-pin I/O Terminal Blocks, A and B, are located on the rear panel and provide the
interface to: a single transistor output, four 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 blocks.
Note that the wiring for the pins on incoming plug connectors is not identical, but instead
on opposite sides in relation to each other. Check the rear panel before wiring.
Connector Pinout - Terminal Blocks A & B
Pin Function
A1 GND
A2 Digital Input 1
A3 Digital Input 2
A4 Digital output
B1 Digital Input 3
B2 Digital Input 4
B3 RS485A
B4 RS485B
Function
CD
- RXD
- TXD
DTR
GND
DSR
RTS
CTS
RI
To activate, connect to GND.
To activate, connect to GND.
With a maximum load of 100mA and maximum voltage of 24V DC, this
output has an open-collector NPN transistor with the emitter connected
to pin 1. If it is to be used with an external relay, a diode must be con-
nected in parallel with the load for protection against any voltage tran-
sients.
To activate, connect to GND
To activate, connect to GND
RS-485/422 - A (non-inverting). A half-duplex RS-485/422 interface for
controlling auxiliary equipment.
RS-485/422 - B (inverting)
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Description
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