Honeywell 7800 SERIES Product Data

7800 SERIESS7800A2142 4Line LCD Keyboard Display Module
53 320011007
Device Address and Baud Rate
Assign each device in the system a unique address by setting the MODBUS ADDRESS (see
page 21). Only RTU communications with 1 Start Bit, 8 Data Bits, 1 Stop Bit and no, odd, or
even parity is supported.
NOTE: Assign a device address number from 01 to 255. 00 is not an acceptable address
number and will not work.
NOTE: In Table 16: Line 1 and Line 2 refer to the two lines of text on the S7800 Keyboard
Display Module. In Table 20: The String Code column references Table 21, String
Codes. In Table 16: The Burner Control State Bits column references Table 19,
Burner Con- trol State Bits.
Address
(hex)
Reg-
ister
(dec)
Parameter
Name
Read/
Write
For-
mat
Notes
0000 40001
Burner Control
(BC) Fault Code
R U16
See Table 22. Non-zero value = Lockout
number.
0001 40002
BC Fault String
Code
R U16 See Table 21. Lockout text.
0002 40003
BC Sequence
State
R U16 See Table 20 (valid only if Fault code = 0).
0003 40004
BC State String
Code (line 1)
R U16 See Table 21. Simulates Line 1 of S7800.
0004 40005
BC State String
Code (line 2)
R U16 See Table 21. Simulates Line 2 of S7800.
0005 40006
BC Sequence
time
R U16 0-4095 Seconds.
0006 40007 BC Total cycles R U32 Max value is 0xFFFFFFFF.
0008 40009 BC Total hours R U32 Max value is 0xFFFFFFFF.
000A 40011
BC Flame 1 sig-
nal strength
R U16
0 to 255 represents 0.0 to 25.5 volts. Not
clipped to 5.0V like S7800.
000B 40012
BC Flame 2 sig-
nal strength
R U16 0 to 4095. N/A for 7800 SERIES.
000C 40013 BC State Bits R U16 See Table 19.
000D 40014
S7830 First Out
Code
R U16 Not supported from S7800.
000E 40015 S7830 State Bits R U32
0010-
0019
40017-
40026
BC Fault history
record 1
R Newest fault record. See Table 23.
001A-
0023
40027-
40036
BC Fault history
record 2
R Second newest fault record. See Table 23.
0024-
002D
40037-
40046
BC Fault history
record 3
R Third newest fault record. See Table 23.
002E-
0037
40047-
40056
BC Fault history
record 4
R Fourth newest fault record. See Table 23.
0038-
0041
40057-
40066
BC Fault history
record 5
R Fifth newest fault record. See Table 23.
0042-
004B
40067-
40076
BC Fault history
record 6
R Oldest fault record. See Table 23.
004C 40077
BC Flame Failure
Response Time
R U16 Tenths of Seconds.
004D 40078
BC Manufactur-
ing code
R U32
004F 40080 BC Type Code R U16 See Table 18.
0050 40081
S7800M/BC
Software version
R U32
0052 40083
EA Software
version
R U32 Does not apply.

Honeywell 7800 SERIES Specifications

General

Model	7800 SERIES
Category	Control Unit
Frequency	50/60 Hz
Approvals	UL, CE
Communication	Communication Interface (Optional)