Honeywell S7800A1142 Manual page 39

Device Address and Baud Rate
Assign each device in the system a unique address by setting the
MODBUS ADDRESS (see page 26). Only RTU communications
with 1 Start Bit, 8 Data Bits, 1 Stop Bit and no parity is supported.
NOTE: Assign a device address number from 01 to 99. 00 is
not an acceptable address number and will not work,
except for the broadcast ability of function 6.
Address Register
(hex) (dec)
0000 40001 Burner Control (BC) Fault Code R
0001 40002 BC Fault String Code
0002 40003 BC Sequence State
0003 40004 BC State String Code (line 1) R
0004 40005 BC State String Code (line 2) R
0005 40006 BC Sequence time
0006 40007 BC Total cycles
0008 40009 BC Total hours
000A 40011 BC Flame 1 signal strength
000B 40012 BC Flame 2 signal strength
000C 40013 BC State Bits
000D 40014 S7830 First Out Code
000E 40015 S7830 State Bits
0010- 40017- BC Fault history record 1
0019 40026
001A- 40027- BC Fault history record 2
0023 40036
0024- 40037- BC Fault history record 3
002D 40046
002E- 40047- BC Fault history record 4
0037 40056
0038- 40057- BC Fault history record 5
0041 40066
0042- 40067- BC Fault history record 6
004B 40076
004C 40077 BC Flame Failure Response
Time
004D 40078 BC Manufacturing code
004F 40080 BC Type Code
0050 40081 S7800M/BC Software version R
0052 40083 EA Software version
0054 40085 BC Remote Command status. R
0055 40086 BC Flame Amplifier type
0056 40087 BC Purge Time
0057- 40088- BC Diagnostics
0065 40102
0066 40103 Post-Purge time
Table 17. ModBus™ Register Assignments.
Read/
Parameter Name Write Format
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
7800 SERIES S7800A1142 KEYBOARD DISPLAY MODULE
NOTE: In Tables 10, 15 and 18: Line 1 and Line 2 refer to the
two lines of text on the S7800 Keyboard Display Mod-
ule. In Tables 21, 23 and 24: The String Code column
references Table 21, String Codes. In Table 22: The
Burner Control State Bits column references Table
21, Burner Control State Bits..
U16 See Table 23. Non-zero value = Lockout number.
U16 See Table 22. Lockout text.
U16 See Table 23 (valid only if Fault code = 0).
U16 See Table 22. Simulates Line 1 of S7800.
U16 See Table 22. Simulates Line 2 of S7800.
U16 0-4095 Seconds.
U32 Max value is 0xFFFFFFFF.
U32 Max value is 0xFFFFFFFF.
U16 0 to 255 represents 0.0 to 25.5 volts. Not clipped to 5.0V like
S7800.
U16 0 to 4095. N/A for 7800 SERIES.
U16 See Table 20.
U16 Not supported from S7800.
U32
Newest fault record. See Table 24.
Second newest fault record. See Table 24.
Third newest fault record. See Table 24.
Fourth newest fault record. See Table 24.
Fifth newest fault record. See Table 24.
Oldest fault record. See Table 24.
U16 Tenths of Seconds.
U32
U16 See Table 19.
U32
U32 Does not apply.
U16 Bit 0: Autonomous.
Bit 1: Remote commanded off.
Bit 2: Remote commanded High fire.
Bit 3: Remote commanded low fire.
Bit 4: Remote reset has/will be sent to BC.
Bits 5-14: Unused.
Bit 15: Copied after the most recent write to the burner
control command (40128 bit 15).
U16 0 = Standard
1 = Unknown
2 = Amplicheck or missing amplifier
3 = Shutter
U16 Seconds
U16 String codes indicating terminal/jumper state. See Table 20. There
are up to 15 codes. Not all are used for some burner controls.
U16 Seconds
39
Notes
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