Specification Sheet

7800 SERIESS7800A2142 4Line LCD Keyboard Display Module
55 320011007
Address
(hex)
Reg-
ister
(dec)
Parameter
Name
Read/
Write
For-
mat
Notes
01BA 40443
Device Data
Ready
U16
Device data was properly received by
S7800. Bit(s) Device
0 RM78XX
3 EC78XX
4-15 Unused
01BB 40444
S7800 Device
Compatibility
with Current
Software Revi-
sion
S7800 Software
Revision Com-
patibility with
Legacy Software
Revisions.
U16
Device is compatible with the S7810M
version Bit Device
0 RM78XX
3 EC78XX
4-7 Unused
Used for indication of S7800 revision
compatibility. Bit(s) Compatible with:
8 Series 2
9-15 Future
01BC 40445
Modbus U32
Endian
R/W U16
Endian order for U32 registers: 0 =
Big-Endian (MS U16 first) 1 = Little-Endi-
an (LS U16 first)
Table 16. ModBus™ Register Assignments.
NOTE: “Device Data Ready” and “S7800 Compatibility” bits can be used to quickly check
device availability and compatibility then read/write registers of only these
devices.
Response Message Format for Function Code 17
This format is device specific and is only available for the 7800 SERIES burner control. See
Table 17.
Slave
Address
Func-
tion
Code
Byte
Count
Slave
ID
a
Run
Indicator
Status
b
Device
Descrip-
tion
c
N/A CRC CRC
Byte 0 1 2 3 4 5-15 16-23 24 25
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 1-11).
Table 17. Response Message Format for function code 17 (11h), (26 bytes).