Axis Communications 221 - Manual (Page 43)

43 AXIS 221 - Unit Connectors
The RS-232 Connector
The AXIS 221 provides one 9-pin D-sub connector, providing the physical interface for an
RS-232 port, used for connecting accessory equipment.
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
5 GND
6 DSR
7 RTS
8 CTS
9 RI
5 4 3 2 1
6 7 8 9