EIA-232 Pin-Out


DB-25 Connector Pin Out  (EIA-232-F)

Pin Name  Function
-------------------------------------------------
1   ---   Shield
2   BA    Transmitted Data
3   BB    Received Data
4   CA    Request To Send
5   CB    Clear To Send
6   CC    DCE Ready
7   AB    Signal Common
8   CF    Received Line Signal Detector
9   --    Reserved
10  --    Reserved
11  --    Unassigned
12  SCF   Secondary Received Line Signal Detector
13  SCB   Secondary Clear To Send
14  SBA   Secondary Transmitted Data
15  DB    Transmitter Signal Element Timing (DCE)
16  SBB   Secondary Received Data
17  DD    Receiver Signal Element Timing
18  LL    Local Loopback
19  SCA   Secondary Request To Send
20  CD    DTE Ready
21  RL    Remote Loopback
22  CE    Ring Indicator
23  CH/CI Data Signal Rate Selector
24  DA    Transmitter Signal Element Timing (DTE)
25  TM    Test Mode
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DE-9 Connector Pin Out (EIA-574)

Pin Name Function
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1   CD    Carrier Detect
2   RXD   Receive Data
3   TXD   Transmit Data
4   DTR   DTE Ready
5   GND   Signal Common
6   DSR   DCE Ready
7   RTS   Request To Send
8   CTS   Clear To Send
9   RI    Ring Indicator
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RJ-45 Connector Pin Out  (EIA-561, RS232D)

Pin Name  Function
-------------------------------------------------
1   RI    Ring Indicator
2   DCD   Carrier Detect
3   DTR   DTE Ready
4   GND   Signal Common
5   RXD   Receive Data
6   TXD   Transmit Data
7   CTS   Clear To Send
8   RTS   Request To Send
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