7800 SERIES S7800A KEYBOARD DISPLAY MODULE
65-009
0-6
34
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 16. ModBus™ Register Assignments.
dd
ess
(hex)
Registe
(dec)
Parameter Name
Read
Write Format Notes
0000 40001
Burner
Control
(BC) Fault Code R U16 See Table 22. Non-zero value = Lockout numbe
.
0001 40002 BC Fault String Code R U16 See Table 21. Lockout text.
0002 40003 BC Sequence S
ate R U16 See Table 22 (valid only if Fault code = 0).
0003 40004 BC
ate
tring Code (line 1) R U16 See Ta ble 21. Simulates Line 1 of S7800.
0004 40005 BC
ate
tring Code (line 2) R U16 See Ta ble 21. Simulates Line 2 of S7800.
0005 40006 BC Sequence time R U16 0-4095 Seconds.
0006 40007 BC To
al cycles R U32 Max value is 0xFFFFFFFF.
0008 40009 BC To
al hours R U32 Max value is 0xFFFFFFFF.
000A 40011 BC Flame 1 signal strength R U16 0 to 255
epresen
s 0.0 to 25.5 vol
s. Not clipped to 5.0V like
S7800.
000B 40012 BC Flame 2 signal strength R U16 0 to 4095. N/A fo
7800 SERIES.
000C 40013 BC
ate Bi
s R U16 See Ta ble 19.
000D 40014 Unused
000E 40015 Unused
0010-
0019
40017-
40026
BC Fault history
ecord 1 R
Newest fault reco
d. See Table 23.
001A-
0023
40027-
40036
BC Fault history
ecord 2 R
Second newest fault record. See Table 23.
0024-
002D
40037-
40046
BC Fault history
ecord 3 R
Third newest fault reco
d. See Table 23.
002E-
0037
40047-
40056
BC Fault history
ecord 4 R
Fourth newest fault record. See Table 23.
0038-
0041
40057-
40066
BC Fault history
ecord 5 R
Fifth newest fault reco
d. See Table 23.
0042-
004B
40067-
40076
BC Fault history
ecord 6 R
Oldest fault record. See Table 23.
004C 40077 BC Flame Failu
e Response
Time
R U16 Tenths of Seconds.
004D 40078 BC Manufactu
ing code R U32
004F 40080 BC Type Code R U16 See Table 18.
0050 40081 SS7800/BC Soft
are version R U32
0052 40083 Unused
0054 40085 BC Remote Command s
atus. 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 Amplifie
type R U16 0 = S
andard
1 = Unknown
2 = Amplicheck or missing amplifier
3 = Shutter
0056 40087 BC Pu
ge Time R U16 Seconds
0057-
0065
40088-
40102
BC Diagnostics R U16
St
ing codes indicating terminal/jumpe
state.
See
Table 20.
The
e
are
up to 15
codes.
Not
all
are
used
for
some
burner
controls.
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