Honeywell 7800 Series Product Data page 53

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.
Reg-
Address
ister
(hex)
(dec)
0000 40001
0001 40002
0002 40003
0003 40004
0004 40005
0005 40006
0006 40007
0008 40009
000A 40011
000B 40012
000C 40013
000D 40014
000E 40015
0010- 40017-
0019 40026
001A- 40027-
0023 40036
0024- 40037-
002D 40046
002E- 40047-
0037 40056
0038- 40057-
0041 40066
0042- 40067-
004B 40076
004C 40077
004D 40078
004F 40080
0050 40081
0052 40083
7800 SERIESS7800A2142 4-Line LCD Keyboard Display Module
Parameter Read/
Name Write
Burner Control
R
(BC) Fault Code
BC Fault String
R
Code
BC Sequence
R
State
BC State String
R
Code (line 1)
BC State String
R
Code (line 2)
BC Sequence
R
time
BC Total cycles R
BC Total hours R
BC Flame 1 sig-
R
nal strength
BC Flame 2 sig-
R
nal strength
BC State Bits R
S7830 First Out
R
Code
S7830 State Bits R
BC Fault history
R
record 1
BC Fault history
R
record 2
BC Fault history
R
record 3
BC Fault history
R
record 4
BC Fault history
R
record 5
BC Fault history
R
record 6
BC Flame Failure
R
Response Time
BC Manufactur-
R
ing code
BC Type Code R
S7800M/BC
R
Software version
EA Software
R
version
For-
mat
See Table 22. Non-zero value = Lockout
U16
number.
U16 See Table 21. Lockout text.
U16 See Table 20 (valid only if Fault code = 0).
U16 See Table 21. Simulates Line 1 of S7800.
U16 See Table 21. Simulates Line 2 of S7800.
U16 0-4095 Seconds.
U32 Max value is 0xFFFFFFFF.
U32 Max value is 0xFFFFFFFF.
0 to 255 represents 0.0 to 25.5 volts. Not
U16
clipped to 5.0V like S7800.
U16 0 to 4095. N/A for 7800 SERIES.
U16 See Table 19.
U16 Not supported from S7800.
U32
Newest fault record. See Table 23.
Second newest fault record. See Table 23.
Third newest fault record. See Table 23.
Fourth newest fault record. See Table 23.
Fifth newest fault record. See Table 23.
Oldest fault record. See Table 23.
U16 Tenths of Seconds.
U32
U16 See Table 18.
U32
U32 Does not apply.
53
Notes
32-00110-07