32
Code Meaning
03 (03 h)
Read-out of n-registers
06 (06 h)
Recording of a single register
16 (10 h)
Recording of n-registers
17 (11 h)
Identification of the slave device
Function description
Table 3
Company specification.
Set of serial link parameters of meters in the MODBUS protocol:
meter address
- 1... 247
baud rate
- 2400, 4800, 9600 bit/s
working mode
- ASCII, RTU
information unit
- ASCII: 8N1, 7E1, 7O1
- RTU:
8N2, 8N1, 8E1, 8O1
maximal response time
500 ms
The configuration of serial link parameters is described in the further part of the user’s
manual. It consists on the establishment of the baud rate (
bAud
parameter), device
address (
Adr
parameter) and the type of information unit (
trYb
parameter).
Note:
Each meter connected to the communication network must have:
a unique address, different from addresses of other devices connected
in the network,
an identical baud rate and information type.
6.3. Description of the MODBUS protocol functions
Following functions of the MODBUS protocol have been implemented in NA5
meters:
The maximal number of registers for writing or readout by one
order is equal 28.