What is Transparent Transmission?

Transparent transmission means that no matter what bit combination the transmitted data is, it should be able to be transmitted on the link. When the bit combination in the transmitted data happens to be exactly the same as a certain piece of control information, appropriate measures must be taken so that the receiver will not mistake such data as some kind of control information. Only in this way can the transmission of the data link layer be guaranteed to be transparent.

In other words, the module is open and transparent to users. In fact, in point-to-multipoint network communication, we can completely equate the wireless data transparent transmission mode with the wired bus mode:
1. The transparent transmission process is transparent to the outside world. That is to say, the transmission network is only responsible for transmitting the services that need to be transmitted to the destination node, regardless of the transmitted services, while ensuring the quality of the transmission, without processing the transmitted services.
2. Transparent transmission, no matter what the transmission is, the equipment used only serves as a channel to transmit the content to be transmitted to the other party.
3. The transparently transmitted device is a black box, and whatever comes in will go out.
4. Transparent transmission means that data passes directly through the interconnection function mode in the system without RLP (Radio Link Protocol) error correction. If RLP error correction is performed, it is non-transparent transmission.
5. Transparent transmission does not care about the transmission of lower layer protocols.

Transparent transmission usually used in reading the remote serial data. Transparent transmission is equivalent to a serial line. Which can be widely used in energy and power, automatic meter reading, smart city, industrial automation, vehicle-mounted traffic, environmental monitoring, equipment monitoring, modern agriculture, and many other industries.

Serial Mode and Qixiang Router Configuration

There are multiple serial mode, Qixiang router and serial modem offer 9 modes to support customer working scenario, customer can select different working mode according to the actual demand. Following introduce each working mode and configuration:

1.TCP Server Mode
The serial server work as a TCP server and configures an IP port number, passively waiting for remote host to connect. When remote host initiates a connection request and establishes connection with the serial server, the remote host can achieve two-way transparent transmission with serial device through the network connection. Remote host can read or send data to a serial device simultaneously.

> Click Advanced Network > Smartlink > General > Mode Configuration > click EDIT, Select TCP Server Working Mode, click SAVE & APPLY button
Note: COM1 is terminal block interface, COM2 is DB9 form interface

2.TCP Client Mode
Serial server host IP and port number actively establish a TCP protocol connection with remote PC, then serial server can achieve two-way transparent transmission with remote PC through the network connection. Remote PC can send and receive data to a serial device simultaneously.

> Click Advanced Network > Smartlink > General > Mode Configuration > click EDIT, Select TCP Client Working Mode, fill in Server Address (IP:Port), click SAVE & APPLY button

3.UPD Server Mode
Similar with TCP Server Mode, the different is it use UDP protocol to build network connection

4.UDP Client Mode
Similar with TCP Client Mode, the different is it use UDP protocol to build network connection

5.RealCom Mode
Serial server connect with virtual serial port of remote PC. Virtual serial tool establish transparent transmission between the host and serial device, then mapping server serial port to local virtual serial device, achieve transparent transmission between the real serial port and virtual serial port.

> Click Advanced Network > Smartlink > General > Mode Configuration > click EDIT, Select RealCom Working Mode, click SAVE & APPLY button

6.UDP Range Mode
Serial server establish connection with multiple hosts on the same network segment specified by the user through UDP protocol, it can achieve point-to-multiple data communication. Serial devices in UDP Range Mode can receive data from one or multiple hosts.

> Click Advanced Network > Smartlink > General > Mode Configuration > click EDIT, Select UDP Range Working Mode, fill in Address.Start/End, click SAVE & APPLY button

7.UDP Multicast Mode
Serial server use UDP protocol to unicast or multicast data to one/multiple hosts assigned by the user, it can receive unicast and multicast data from one/multiple devices.

> Click Advanced Network > Smartlink > General > Mode Configuration > click EDIT, Select UDP Multicast Working Mode, fill in Destination Address/Reception Address (IP:Port), click SAVE & APPLY button

8.Pair Master/Slave Mode
This mode require two serial server to work together, one configured as Pair Slave Mode and the other configured as Pair Master Mode, it can break through serial data transmission distance limitation. One serial server work as server, the other work as client.

> Serial Server A: Click Advanced Network > Smartlink > General > Mode Configuration > click EDIT, Select Pair Master Working Mode, fill in Server Address(IP:Port), click SAVE & APPLY button

> Serial Server B: Click Advanced Network > Smartlink > General > Mode Configuration > click EDIT, Select Pair Slave Working Mode, fill in Listen Port , click SAVE & APPLY button

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