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4. RS-232C Input /Output
DB-25 D-sub-9 Signal Direction Signal Name
1 x Protective Ground
2 3 DTE-to-DCE Transmitted Data
3 2 DCE-to-DTE Received Data
4 7 DTE-to-DCE Request To Send
5 8 DCE-to-DTE Clear To Send
6 6 DCE-to-DTE Data Set Ready
7 5 x Signal Ground
8 1 DCE-to-DTE Received Line Signal Detector (Carrier Detect)
20 4 DTE-to-DCE Data Terminal Ready
22 9 DCE-to-DTE Ring Indicator
5. RJ-45 Input
Pin Signal Assignment Pin Signal Assignment
1 Transmit+ 2 Transmit-
3 Receive+ 4 N/A
5 N/A 6 Receiver–
7 N/A 8 N/A
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