Honeywell S7800A1142 Manual page 40

7800 SERIES S7800A1142 KEYBOARD DISPLAY MODULE
Address Register
(hex) (dec)
0067 40104 Valve Proving Mode
0068 40105 Valve Proving option
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 14.
Table 18. Response Message Format for function code 17 (11h), (26 bytes).
Slave Function
Address
Byte 0 1
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).
65-0288-1
Table 17. ModBus™ Register Assignments. (Continued)
Read/
Parameter Name Write Format
R
R
R
R/W
Code Byte Count Slave ID
2 3
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 S7810M version
Bit
0
3
4-7
Used for indication of S7800 revision compatibility.
Bit(s)
8
9-15
Run Indicator Device
a b
Status Description
4 5-15
40
Notes
a
Device
RM78XX
EC78XX
Unused
Device
RM78XX
EC78XX
Unused
Compatible with:
Series 2
Future
c
N/A CRC
16-23 24
CRC
25