CLASSIC
®
800 Product Manual
44
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Modbus RTU Interface
5. Coils
A value of “0” indicates “inactive” (i.e. relay not energized, mode or timer not active, or 4-20 mA analog loop
open). The coil values are also available in a single holding register; 40528 “BCoils”.
6. Holding Registers
Holding registers 40001 to 40048 are common status and configuration information.
All Holding Registers can be written to, but exercise care to avoid undesirable or incorrect behavior. Never write
to Registers 40513 to 40535, except for Register 40517 which can be used to cause the CLASSIC to restart.
When writing to the CLASSIC to change its configuration, finish by writing ‘00F5h’ to Register 40517 to cause a
restart. This will ensure the new configuration takes effect.
Coil Number
Address (Hex)
Coil Function
1
0000
Relay 1
2
0001
Relay 2
3
0002
Run Mode
4
0003
Fault Mode
5
0004
Bypass Mode
6
0005
Loop Status
7
0006
-
8
0007
-
9
0008
Relay 1 Timer
10
0009
Relay 2 Timer
11
000A
Relay 1 Timer
12
000B
Relay 2 Timer
13
000C
-
14
000D
-
15
000E
-
16
000F
-
Modbus
Registers
Address
(Hex)
Register Name
Description
40001
0000
PIDC
Product ID in high byte and Software revision in low byte
40002
0001
Node Address
Modbus server address. The upper byte must be 0.
40003-40004
0002-0003
ESN
Electronic Serial number formatted as a double word.
40005
0004
-
-
40006
0005
Bypass Delay
Number of 5 second delays from 0 to 20 (0 to 100 seconds)
Table 3 - Coils
Table 4 - Low Holding Registers (Configuration and Status)
