Appendix E: Modbus Function - Honeywell 7800 Series Product Data

Message Message
Group Number
Standard 4
Standard 5
Standard 6
Standard 7
Standard 8
Standard 9
Standard 10
Standard 11
Standard 12
Standard 13
Standard 14
Standard 15
Standard 16
Standard 17
Standard 18
Standard 19 Gas
Standard 19 Oil
Standard 20
Standard 21
Standard 22
Fixed 23
Fixed 24
Fixed 25
Fixed 26
Fixed 27
Fixed 28
Fixed 29
Fixed 30
Fixed 31
Fixed 32
Fixed 33
Fixed 34
Fixed 35
Fixed 36
Fixed 37
Fixed 38
Fixed 39
Custom 45
Custom 46
Custom 47
Custom 48
7800 SERIESS7800A2142 4-Line LCD Keyboard Display Module
Text
Valve close Custom
Burner switch Custom
Operating Custom
Custom
control
Custom
Auxiliary Limit
Custom
#1
Custom
Auxiliary Limit
Custom
#2
Custom
Low water cut-
Custom
off (LWCO)
Custom
High limit
Custom
Auxiliary Limit
Custom
#3
Custom
Oil selection
Custom
High oil pres-
Custom
sure
Low oil pres-
* Custom message text is editable so this text can
sure
High oil tem-
Table 7. Annunciator Terminal Messages
perature
Custom annunciator and Call for Service
Low oil tem-
messages can be edited using the
perature
characters listed in the following table.
Gas selection
High gas
(space) A-Z a-z 0-9 .
pressure
Low gas pres-
sure
Atomizing
Table 8. English Character Set
switch
When the selected language is French
Airflow switch
or Spanish, the character set for those
Auxiliary ILK
languages will be shown on the display.
#4
This table only shows the English character
Auxiliary ILK
set.
#5
High water
Low water
APPENDIX E: MODBUS
High stack
High blast
FUNCTION
Low pilot
High pilot
See page 28 APPENDIX A: DISPLAY
Combustion
SETUP for Setup.
damper
Stack damper
OPERATION
PV
FD fan ILK
The S7800 ModBusTM Data Feature
Recirculating
enables terminal 1, 2 to Data + and Data -.
fan
Table 16 provides register mapping. It
Exhaust fan
identifies the mapping of the 7800 SERIES
Combustion
parameters to ModBusTM registers.
fan
Oil pump
Function Codes
Low FGR
Supported function codes of Modbus
Low combus-
tion AP Protocol Reference Guide (PI-MBUS-300
High tempera- Rev. J) are 3, 4, 6, 16, and 17. Function
ture
codes 3 and 4 are treated the same by the
ControLinks
S7800. Two registers should be read when
Default 1*
the data format is a U32 value (4 bytes); if
Default 2*
both registers are not read, then data for a
Default 3*
part of the value is returned. U32 values are
Default 4*
either in Big-endian or Little-endian format.
51
Message Message
Group Number
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
vary.
< > { }
_ = ( )
! ?
Text
Default 5*
Default 6*
Default 7*
Default 8*
Default 9*
Default 10*
Default 11*
Default 12*
Default 13*
Default 14*
Default 15*
Default 16*
Default 17*
Default 18*
Default 19*
Default 20*
, - / : " ?
[ ] ; "" \ |
* & ^ % $ # @
32-00110-07
+