1.  Overview

The Yacer HDLC-ETH protocol converter, provides dual or quad RS-232 synchronous & asynchronous serial ports, dual 10/100M Ethernet interface to achieve the protocol conversion between the serial port and the Ethernet interface.

Small size, 12 VDC power supply, industrial wide temperature.

2.  Application

●  Protocol conversion between the serial port and Ethernet

●  Multiplexer of serial ports, Support the serial port to be divided into multiple channels

●  Air traffic control radar signal splitter

●  Air traffic control and the monitoring system, ADS-B, secondary radar (SSR) signal connection and output

●  Air traffic control automation system (ATC), air traffic management (ATM)

●  Data recording and playback of ATC Radar

●  Embedded application

3.  Interface

3.1  Serial Port

HDLC-ETH provides 2 or 4-way RS-232 synchronous serial ports, each port supports HDLC protocol, and adopts RJ-45 connector. Each RJ45 interface is equipped with two indicator lights, among which the yellow light flashes to indicate data transmission and the green light flashes to indicate data reception.

Serial Features are shown as below：

●  RS-232 standard interface

●  Full-duplex, Baud rate up to 250 Kbps

●  Synchronous HDLC, Asynchronous UART working mode

●  Clock support: general, master clock, slave clock (external clock)

●  NRZ encoding format

●  15 KV ESD protection

3.2  Ethernet Interface

Dual 10/100M Ethernet are adopted RJ-45 interface, support for auto MDI/MDI-X crossover, Ethernet switching and dual IP functions.

3.3  Power Interface

HDLC-ETH is powered by the 12V DC power supply. 

4.  Functions

4.1  Working mode of the serial port

Serial ports S1, S2 are synchronous and asynchronous, with support for the synchronous and asynchronous working modes described in the table below.

4.2  UDP to Serial Conversion

With HDLC-ETH, PC or server can realize the transmit function of the synchronous HDLC serial port.

The typical application is shown as follows. PC sends a UDP message over the Ethernet interface as the UDP Client, and HDLC-ETH sends it out from the synchronous serial port after converting the received UDP message into the HDLC frame or the UART data.

4.3  Serial to UDP Conversion

The HDLC-to-UDP function figures is shown below. HDLC-ETH receives the synchronous HDLC frame or asynchronous UART frame from other devices over the serial interface, converts it into the UDP message and sends to PC or server over Ethernet. 

4.4 Serial to serial port

Serial-serial can forward the input data of the specified serial port to other serial port outputs, which is mainly used for:

●  Conversion between synchronous and asynchronous serial ports

●  Serial port Demultiplexer: Divide the single serial port data into multi-channel data. Unlike the common demultiplexer, demultiplexing is possible with HDLC-ETH, the different baud rates and clock modes can be set for each-channel serial port, avoiding the packet loss caused by clock inconsistency

Configuration shown above realizes the application of the input demultiplexing of the serial port S1 to S2, S3 and S4 outputs. HDLC-ETH performs storing and forwarding on the received data. Even if the baud rate and clock mode of S1, S2, S3 and S4 are different, packet will not loss.