Crystal Vision
Installation
Indigo 4 User Manual R1.7
13
09/08/2012
RJ45 422 Bus IO connector
Pin number
Function
1, 2 and 3
Not used – 75 Ohm resistor to GND in
frame
4
TX+ bus RS422
5
TX- bus RS422
6
Not used – 75 Ohm resistor to GND in
frame
7
RX+ bus RS422
8
RX- bus RS422
The signals on pins 4, 5, 7 and 8 are also available on the Remote 6 connector.
Note:
TX and RX are defined on the boards. This connector can be used to connect a REMIND remote
control panel. If an external RS422 control device is to be used ensure that the controller will drive
the RX+ with TX+ etc.
Note:
Since the 422 Bus Output connector has no GND pin, two frames or other pieces of equipment
which make a connection from the 422 Bus Output should ensure the GND of the two frames are
connected together. This will normally occur through the earth pin on the mains connector.
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 6 connector.
2.3 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 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 bottom of the lower front control panel PCB by opening the panel and lifting it
upwards.
