Honeywell 7800 Series Product Data page 55

Reg-
Address
ister
(hex)
(dec)
01BA 40443
01BB 40444
01BC 40445
Table 16. ModBus™ Register Assignments.
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.
Slave
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 1-11).
Table 17. Response Message Format for function code 17 (11h), (26 bytes).
7800 SERIESS7800A2142 4-Line LCD Keyboard Display Module
Parameter Read/
Name Write
Device Data
Ready
S7800 Device
Compatibility
with Current
Software Revi-
sion
S7800 Software
Revision Com-
patibility with
Legacy Software
Revisions.
Modbus U32
R/W
Endian
Func-
Slave
tion Byte
Code Count
2 3
For-
mat
Device data was properly received by
S7800. Bit(s)
U16 0
3
4-15
Device is compatible with the S7810M
version Bit
0
3
4-7
U16
Used for indication of S7800 revision
compatibility. Bit(s) Compatible with:
8
9-15
Endian order for U32 registers: 0 =
U16 Big-Endian (MS U16 first) 1 = Little-Endi-
an (LS U16 first)
Run
Indicator
ID a
Status b
4
55
Notes
Device
RM78XX
EC78XX
Unused
Device
RM78XX
EC78XX
Unused
Series 2
Future
Device
Descrip-
N/A
tion c
5-15 16-23 24
CRC CRC
25
32-00110-07