HF2221 Serial Server Device User Manual
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Figure 5. HF2221 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
Table 4. RJ45 Interface
Pin Number
Name
Description
1
TX+
Transfer Data+
2
TX-
Transfer Data-
3
RX+
Receive Data+
4
PHY-VCC
Transformer Tap Voltage
5
PHY-VCC
Transformer Tap Voltage
6
RX-
Receive Data-
7
N.C.
None Connect
8
N.C.
None Connect
2.6. Mechanical Size
The dimensions of HF2221 are defined as following picture (mm):
