55xGenComm1_29
51
GenComm Page 14 - Diagnostic - LEDs
1. These registers represent the state of the actual LEDs on the control unit and can be used for
creating module mimics or diagnostic displays.
2. Register 0 indicates the number of LEDs that are supported. The 55x module support only up
to LED 16. 52xx module supports upto LED 30.
3. Attempting to read past register 4 from a 550 / 555 module will return 15 (unimplemented).
Registers
These are all read only registers
Register offset
Name
Min value
Max value
Bits/ Sign
0
Number of LEDs
0
128
16
1
LED 1
0
15
13/16-16/16
LED 2
0
15
9/16-12/16
LED 3
0
15
5/16-8/16
LED 4
0
15
1/16-4/16
2
LEDs 5-8
0
15
16
3
LEDs 9-12
0
15
16
4
LEDs 13-16
0
15
16
5
LEDs 17-20
0
15
16
6
LEDs 21-24
0
15
16
7
LEDs 25-28
0
15
16
8
LEDs 29-32
0
15
16
LED codes
Code Colour
0 Not
lit
1 Reserved
2
Lit (All LEDs are red on 550 / 555 control modules)
15 Unimplemented
LED
LED identification (55x)