65
58800-58928
Number
of
transmissions
UInt16(RO)
The cumulative number of
transmissions used to debug slave access
E.g:
The settings are as follows: The first group slave station address is 1, the start address is set to 0, the communication length is 125, the
second group slave station address is 2, the start address is 20, and the communication length is 125, the read information area
40000-40124 corresponds to the information of the first group of slave station addresses 0-125, 40125-40249 corresponds to the
information of the second group of slaves station 20-144, and so on, when the communication length of the 128 groups of devices is 125,
the corresponding information area is 40000 -55999. If fail to read the information from the slave station, the read information area
corresponding to the slave station is 0.
Baud rate (bps)
Read slave station timeout (Recommended
setting time)
Slave station access interval
time
(recommended setting time)
1200
2500ms
10-20ms
2400
2000ms
10-20ms
4800
1500ms
10-20ms
≥
9600
1000ms
10-20ms
8.2.3
Extending RS485 Communication as modbus Master
When the extended communication is used as a master station, a small serial port server can be implemented in conjunction with the
Ethernet interface.
Extended serial port parameter configuration
Method
1
：
6.3
Refer to bus1 in the communication settings of 7.5 system settings to modify the parameters of bus2.
Method
2
：
According to the operation method of 8.1.3, after connecting the Ethernet module, click Setup->Serial Port to enter the serial port
setting, and set the baud rate, check digit and response time. Click Apply when you are done to wait for it to take effect. As shown below:
Modbus master parameter reading
According to the operation method of 8.1.3, after connecting the Ethernet module, click Setup->Device List to enter the Modbus
master parameter reading, as shown below.
1. Number of Viewable: Users can configure up to 128 groups of 03 read commands of slaves.
2. Local ID: Meter Slave Address
3. Starting Register: Start Register Address
4. Number Of Register: The length of the register.
Note: If you need to modify the above parameters, please refer to 9.2.2 to modify the settings with the corresponding address by
Modbus-TCP. After the 9.2.2 setting is completed, click Device List to refresh again.
The module will read the data from the slave according to this configuration. The read data is stored in
registers starting with address 40000, which can be read by Modbus-Tcp.
For example: Read by Modbus-Tcp, the first one is to read 10 data starting from register 0 with slave address 1 and read
40000-40009, the second is to read 10 data starting from register 0 with slave address 2, read 40010-40019, and so on.
