KROHNE CORIMASS MFC 85 Interface EN - Manual (Page 29)

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6.2 Function Codes
Table 1 shows the function codes and data types supported by the MFC081/085. All data
types occupy one holding register location. This is achieved by storing the address index of the
data in the holding registers. However, this is invisible to the user who should access register
data in the normal way.
Table 1. Supported ModBus codes.
Register
Address
(hex) Function
Codes
Data
Type
Access Description
00000-
0000F 01
05
bit R
W
Read On/Off status of status/control
bit. (8 bits blocks per read)
Force Single control bit.
20010-
2004F 03
16
float R
W
Read multiple registers. Read 2
registers for each float.
Write multiple registers. Write 2 16bit
registers for each float.
40050-
4006F 03
06
16
int R
W
W
Read multiple registers. Reads 1
register per integer.
Write single register / integer.
Write multiple registers/integers
A0070-
A008F 03
06
16
byte R
W
W
Read multiple registers. Read 1 byte
per register.
Write single byte.
Write multiple bytes
B0090-
B009F 03
16
double R
W
Read multiple registers. Read 4
registers for each double.
Write multiple registers. Write 4
registers for each double .
R=read, W=write.