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Address
Register
(hex)
(dec)
0066
40103
Post-Purge time
0067
40104
Valve Proving Mode
0068
40105
Valve Proving options
0069
40106
Valve Proving time
0066-
40103-
Unused
007E
40127
007F
40128
BC Remote Command
01B7-
40440-
Unused
01B8
40441
01BA
40443
Device Data Ready
01BB
40444
S7800 Device Compatibility
with Current Software
Revision
S7800 Software Revision
Compatibility with Legacy
Software Revisions.
NOTE: "Device Data Ready" and "S7800 Compatibility" bits can be used to quickly check device availability and compatibility
then read/write registers of only these devices.
Response Message Format for Function Code 17.
This format is device specific and is only available for the 7800
SERIES burner control. See Table 17.
Table 17. Response Message Format for function code 17 (11h), (26 bytes).
Slave
Address
Byte
0
a
Slave ID: Always 0x78 when using RM78xx or EC78xx Relay Modules(1 byte) (byte 3).
b
Run Indicator Status: Always FF=ON (one byte) (byte 4).
c
Device Description: 16 Character ASCII OS number for the Burner Control (11 bytes) (bytes 5-15).
Table 16. ModBus™ Register Assignments. (Continued)
Read/
Parameter Name
Write Format
R
R
R
R
R/W
Function
Code
Byte Count Slave lD
1
2
3
7800 SERIES S7800A KEYBOARD DISPLAY MODULE
U16
Seconds
U16
0 = Valve Proving is not enabled
1 = Enabled before Run
2 = Enabled after Run
3 = Enabled before and after Run
4 = Enabled split half before and half after Run
U16
1 = Uncommissioned
2 = Commissioned
U16
Seconds
U16
Only one bit in the LSByte must be set, with the exception of bit 15:
Bit 0 =Revert to autonomous operation.
Bit 1 = Don't fire, remain off.
Bit 2 = Go to Hi Fire during Run.
Bit 3 = Go to Lo Fire during Run.
Bit 4 = Remote reset.
Bits 5-7 must be 0.
Bits 8-14 are ignored.
Bit 15: Copied to the control status register. The remote
control status register can be used to verify operation of the
command.
Bits 1-3 must be refreshed at least every 120 seconds, but
not more than once a second, for the burner control to
remain in the commanded state.
U32
U16
Device data was properly received by S7800.
Bit(s)
0
3
4-15
U16
Device is compatible with the S7800 version.
Bit
0
3
4-7
Used for indication of S7800 revision compatibility.
Bit(s)
8
9-15
Run lndicator
a
b
Status
Description
4
5-15
35
Notes
a
Device
RM78XX
EC78XX
Unused
Device
RM78XX
EC78XX
Unused
Compatible with:
Series 2
Future
Device
c
N/A
CRC
16-23
24
CRC
25
65-0090-6
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