Crystal Vision
Installation
Indigo 2 CoolFlow User Manual R1.3
11
20/06/2012
RJ45 422 Control Input connector
Pin number
Function
1
RX+ RS422 i/p Statesman
2
RX- RS422 i/p Statesman
3
TX+ RS422 o/p Statesman
4 and 5
Not used – 75 ohm resistor to GND in frame
6
TX- RS422 o/p Statesman
7 and 8
Not used – 75 ohm resistor to GND in frame
The signals on pins 1, 2, 3 and 6 are also available on the Remote 2 connector.
Note:
Since there is no ground connection via the 422 Bus two frames or other pieces of
equipment that share this connection must have a common ground connection. This will
normally occur through the earth pins on the mains connectors.
Terminating the RS422 Statesman chain
The RS422 communication chain used for Statesman should be terminated when a frame is
the last device in a chain or a when a frame is the only device. It is unterminated for all other
applications including when frames are used with a Statesman Hub.
To change the RS422 communications termination access the RS422 term/unterm switch at
the top of the front control panel by opening the panel and lifting it upwards.
Statesman RS422 term/unterm switch
To terminate the RS422 link move the switch to the left, to unterminate it move it to the
right.
