Axis Communications T99A12 Guia De Instalacion página 27

AXIS T99A12 Positioning Unit 24 V AC/DC
This table is only valid for the 24 V AC and the 24 V DC power connectors.
Position
24 V AC
1
Protective earth
2
24 V AC Phase
3
24 V AC Neutral
4
Not connected
RS485/RS422 connector
Two 2-pin terminal blocks for RS485/RS422 serial interface used to control auxiliary equipment
such as pan-tilt devices.
The serial port can be configured to support:
• Two-wire RS485 half duplex
• Four-wire RS485 full duplex
• Two-wire RS422 simplex
• Four-wire RS422 full duplex point to point communication
Function
RS485/RS422 RX/TX A 1
RS485/RS422 RX/TX B 2
Pin Notes
(RX) For full duplex RS485/RS422
(RX/TX) For half duplex RS485
27
24 V DC
Protective earth
+ 24 V
0 V
Not connected
EN