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Table 19. Expanded Annunciator First Out Code. (Continued)
EA Status Value
(binary)
Status Message
0xx 01111
High Gas Pres.
0xx 10000
Low Gas Pres.
0xx 10001
Airflow Sw.
0xx 10010
Aux. ILK #4
0xx 10011
Aux. ILK #5
0xx 10100
All Switches On (or)
Other PII (if hold or lockout
condition exists)
0x1 XXXX
Valve Closure
00XX XXXX
Oil Select
01XX XXXX
Gas Select
If the BC is in Standby and the 5LSB value is 1-16, then the cause of
the Standby Hold is the 5LSB value; otherwise the hold is "Circuit
Fault".
Slave
Address
Byte
0
1
a
Slave ID: Always 0x78 when using RM78xx or EC78xx Relay Modules(1 byte) (byte 3).
b
Run Indicator Status: Always FF=ON (one byte)(byte 4).
c
Device Description: 16 Character ASCII OS number for the Burner Control (11 bytes) (bytes 5-15).
Burner Control Type Codes
The burner control type code indicates the exact model number of the
burner control. See Table 21.
Table 21. Burner Control Type Codes.
CODE
0
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
199
200
201
202
203
204
205
206
207
299
Line 2 String Code
(Table 16)
41
59
13
15
16
110
75
109
N/A
N/A
Table 20. Response Message Format for function code 17 (11h), (26 bytes).
Function
Code
Byte Count
Slave ID
2
3
DEVICE DESCRIPTION
(undefined)
RM7800E
RM7800G
RM7800L
RM7800M
RM7838A
RM7838B
RM7840E
RM7840G
RM7840L
RM7840M
RM7885A
RM7888A
RM7890A
RM7895A
RM7895B
RM78xx
EC7810A
EC7820A
EC7830A
EC7850A
EC7885A
EC7890A
EC7895A
EC7895C
EC78xx
Response Message Format for Function Code 17.
This format is device specific and is only available for the 7800
SERIES burner control. See Table 20.
Run Indicator
a
b
Status
Description
4
5-15
7800 SERIES Burner Control State Bits
The burner control sequence state is translated into State Bit Register
as shown in Table 22.
Table 22. Burner Control State Bits.
BIT
Description
0
Initiate
1
Standby
2
Purge
3
Pilot Ignition
4
Main Ignition
5
Run
6
Postpurge
7
Preignition
13
Alarm
14
Hold
15
Lockout
R7999 Profile Data Structure
If an R7999 uses less than 24 indexes for its profile, then the unused
index data will be zero (refer to "Number of Profile Points" parameter
to get the actual number of profile points). Note that the profile
information will be zero for an unconfigured or disconnected R7999.
Up to 24 sets of data are used to build the profile. See Table 23.
17
S7810M MODBUS™ MODULE
Device
c
N/A
CRC
16-23
24
BC State Bits Register
0000 0000 0000 0001
0000 0000 0000 0010
0000 0000 0000 0100
0000 0000 0000 1000
0000 0000 0001 0000
0000 0000 0010 0000
0000 0000 0100 0000
0000 0000 1000 0000
1010 0000 xxxx xxxx
NOTE: Lockout bit is also set.
0100 0000 xxxx xxxx
One other bit may be on.
1010 0000 0000 0000
NOTE: Alarm bit is also set.
CRC
25
65-0249—4
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