Implemented Functions - Michell Instruments Promet EExd User Manual

APPENDIX E
E.2

Implemented Functions

03 Read Holding Registers
This function code is used to read the contents of a contiguous block of holding registers,
where the master specifies the starting address and the number of registers to be read.
Figure 32 shows the state diagram of how the message is processed with the exceptions
that may be raised.
ENTRY
Exception Code = 01
56
Address in message = Instrument Address
Address
Function code supported
0x0000 <= Quantity of Registers <= 0X007d
0x007D
Exception Code = 03
Exception Code = 02
Sends Exception Response
Figure 30 Reading Holding Registers State Diagram
Promet EExd User's Manual
Starting Address = OK
AND
Starting Address + Number of Registers = OK
OK
Request Processing
Reading Registers = OK
Exception Code = 04
97090 Issue 16.1, November 2019
Sends Response with data
EXIT