Honeywell 7800 Series Product Data page 52

7800 SERIESS7800A2142 4-Line LCD Keyboard Display Module
The maximum number of addresses that can be queried is 127 (0x7F) for each query
message.
Table 9 through 12 provide information on the function codes.
NOTE: All Query and Response cells below are 1 byte.
Slave Function
Address Code
03 or
01
04
Table 9. Query Message Format for Function Codes 3 and 4.
Slave Function
Address Code
03 or
01
04
Table 10. Response Message Format for Function Codes 3 and 4.
Slave Function
Address Code
01 06
Table 11. Query Message Format for Function Code 6.
Slave Function
Address Code
01 06
Table 12. Response Message Format for Function Code 6
(There is no response if the query was broadcast.)
Slave Address
03
Table 13. Query Message Format for Function Code 17.
Slave Address
Table 14. Exception Response Message Format.
Exception Code
01
02
03
Table 15. Exception Codes.
32-00110-07
Starting Starting
Address Address
High Low
00
Byte Count Data High
02
Starting Starting
Address Address
High Low
00
Starting Starting
Address Address
High Low
00
Function Code
11
Function Code
Exception Code
+ 80h
Definition
Illegal Function
Illegal Data Ad-
dress
Illegal Data Value
Number
of Ad-
dresses
High
0A 00
Data Low
00
Preset
Data
High
7F 00
Preset
DataHigh
7F 00
CRC
C1
An illegal function as requested. Only 3, 4, 6 and 17 are
Too many bytes requested, address is out of range, reg-
ister is read only, or the number of address requested is
past the last register.
The "Preset Data" from function code 6 is invalid/out of
52
Number
of Ad-
dresses CRC
Low
01 A4
CRC
22 38
Preset
CRC
Data Low
04 B9
Preset
CRC
Data Low
04 B9
CRC
Description
supported.
range.
CRC
08
CRC
5D
CRC
D1
CRC
D1
CRC
4C
CRC