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EtherHub 1500 System User’s Guide
Pin Assignments B-3
DB25 RS232 to RJ-45 Converter Connector Pin Assignment
Description RJ-45 Pin
Mapping
EH1502s DB25
Connector
DTR (Data Terminal Ready) 1 20
RxD (Received Data) 2 3
TxD (Transmitted Data) 3 2
SG (Signal Ground) 4 7
RI (Ring Indicator) 5 22
CTS (Clear-to-Send) 6 5
RTS (Request-to-Send) 7 4
DCD (Data Carrier Detected) 8 8
DSR (Data Set Ready) NC 6
Connection from EH1502s 9-Pin Serial Port to PC’s 9-Pin COM Port
EH1502’s 9-Pin PC’s 9-Pin
Serial Port COM Port
1 DCD ---------------- DCD --------------- 1
2 RXD <-------------- TXD ---------------- 3
3 TXD ---------------- RXD --------------> 2
4 DTR ---------------- DSR --------------> 6
5 SGND -------------- SGND --------------- 5
6 DSR ---------------- DTR --------------- 4
7 RTS ---------------- CTS --------------> 8
8 CTS <-------------- RTS --------------- 7
9 RI ----------------- RI ----------------- 9