HF HF2211A - RS485 Interface; RS422 Interface; RJ45 Interface; Figure 5. HF2211 A RS422 Connection

HF2211A Serial Server Device User Manual
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10
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Pin Number
Name
Description
2
RXD
Receive Data
3
TXD
Send Data
5
GND
GND
7
RTS
Request to Send
8
CTS
Clear to Send
2.3. RS485 Interface
RS485 use two wire links, A(DATA+), B(DATA-). Connect A(+) to A(+), B(-) to B(-) for communication.
The RS485 interface support maximum 32 485 device, special hardware version can support max 255
device. The cable maximum length is 1200 meters. Need to add 120Ohm terminal resistor for over
300 meters.
2.4. RS422 Interface
RS422 interface use T+/T-/R+/R-, cross connect to device as the following picture.
Name
Description
TX+
Transfer Data+
TX-
Transfer Data-
RX+
Receive Data+
RX-
Receive Data-
Figure 5. HF2211A RS422 Connection
2.5. RJ45 Interface
Ethernet port is 10M/100M adaptive, support AUTO MDI/MDIX which means it support direct
connecting to PC with Ethernet cable.
Figure 6. RJ45 Pin Defination