RS485 TO ETH ( B)
configured according to the baud rate . However, if the user's Modus command is relatively long
or the conversion protocol is "None", these two parameters need to be configured manually.
The following describes the recommended settings of the above parameters:
1. Figure 30 shows the "RS485 bus anti-collision time". Generally, it can be set to twice the
"Packet Interval" in the lower right corner of the parameter configuration interface, but the
minimum should not be less than 20.
2. Figure 29 shows the "RS485 command response timeout time", which is generally
determined according to the length of the back and forth response command. If the sending
command is N bytes and the response is M bytes, the recommended value is: "Packet interval"
× (N+M+5)+100.
7 . 6 . MODBUS UNDER MULTI - DESTINATION IP
As shown in Figure 28, if the serial port device (RTU device) is used as the master station
and the network port device (Modbus TCP device) is used as the slave station, and there are
multiple network port slave devices at the same time. At this time, you can use the method
described in 5.2.2 Client Connecting Multiple Servers to let the serial port server as a client
connect to these multiple network port devices at the same time.
The function that needs to be realized at this time is: when the serial port RTU sends a
command, it can be sent to multiple network port devices, the network port device recognizes
whether to send it to itself through the Slave ID field, and only the network port device
corresponding to the Slave ID responds. After the network port response is sent to the serial
server, it is converted into an RTU command and output from the serial port to the RTU device.
At this time, it should be noted that it is necessary to remove the two checkmarks shown in
Figure 30 as "RS485 bus anti-collision time" and Figure 29 as "RS485 command response timeout
time". Otherwise, the above forwarding function cannot be realized. Another application method
is: Although the serial port server is connected to multiple network port devices as a Client, the
RTU device is not the master station, and the network port device still sends it first, and the RTU
device responds (as a slave station). At this time, the "RS485 bus anti-collision time" and "RS485
command response timeout time" still need to be checked, so that multiple hosts can access one
RTU device at the same time.
8 .
REGISTRATION PACKAGE AND HEARTBEAT PACKAGE
The registration package and the heartbeat package are a function suitable for
communication between the device and the cloud software.
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