7800 SERIES S7800A1142 KEYBOARD DISPLAY MODULE
39 65-0288-1
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.
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..
Table 17. ModBus™ Register Assignments.
Address
(hex)
Register
(dec) Parameter Name
Read/
Write Format Notes
0000 40001
Burner Control (BC) Fault Code
R U16 See Table 23. Non-zero value = Lockout number.
0001 40002 BC Fault String Code R U16 See Table 22. Lockout text.
0002 40003 BC Sequence State R U16 See Table 23 (valid only if Fault code = 0).
0003 40004 BC State String Code (line 1) R U16 See Table 22. Simulates Line 1 of S7800.
0004 40005 BC State String Code (line 2) R U16 See Table 22. 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 signal 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 signal strength R U16 0 to 4095. N/A for 7800 SERIES.
000C 40013 BC State Bits R U16 See Table 20.
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 24.
001A-
0023
40027-
40036
BC Fault history record 2 R Second newest fault record. See Table 24.
0024-
002D
40037-
40046
BC Fault history record 3 R Third newest fault record. See Table 24.
002E-
0037
40047-
40056
BC Fault history record 4 R Fourth newest fault record. See Table 24.
0038-
0041
40057-
40066
BC Fault history record 5 R Fifth newest fault record. See Table 24.
0042-
004B
40067-
40076
BC Fault history record 6 R Oldest fault record. See Table 24.
004C 40077 BC Flame Failure Response
Time
R U16 Tenths of Seconds.
004D 40078 BC Manufacturing code R U32
004F 40080 BC Type Code R U16 See Table 19.
0050 40081 S7800M/BC Software version R U32
0052 40083 EA Software version R U32 Does not apply.
0054 40085 BC Remote Command status. R 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.
a
Bits 5-14: Unused.
Bit 15: Copied after the most recent write to the burner
control command (40128 bit 15).
0055 40086 BC Flame Amplifier type R U16 0 = Standard
1 = Unknown
2 = Amplicheck or missing amplifier
3 = Shutter
0056 40087 BC Purge Time R U16 Seconds
0057-
0065
40088-
40102
BC Diagnostics R U16
String codes indicating terminal/jumper state. See Table 20. There
are up to 15 codes. Not all are used for some burner controls.
0066 40103 Post-Purge time R U16 Seconds
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