Serial Cable PIN out
RS232 DB25(RS-232C)
DB25: View looking into male connector
DB25: View looking into female connector
| Pin No. |
Name |
Dir |
Notes/Description |
| 1 |
- |
- |
Protective/shielded ground |
| 2 |
TD |
OUT |
Transmit Data (a.k.a TxD, Tx) (ASYNC) |
| 3 |
RD |
IN |
Receive Data (a.k.a RxD, Rx) (ASYNC) |
| 4 |
RTS |
OUT |
Request To Send (ASYNC) |
| 5 |
CTS |
IN |
Clear To Send (ASYNC) |
| 6 |
DSR |
IN |
Data Set Ready (ASYNC) |
| 7 |
SGND |
- |
Signal Ground |
| 8 |
CD |
IN |
Carrier Detect (a.k.a DCD). |
| 9 |
- |
- |
Reserved for data set testing. |
| 10 |
- |
- |
Reserved for data set testing. |
| 11 |
- |
- |
Unassigned |
| 12 |
SDCD |
IN |
Secondary Carrier Detect. Only needed if second channel being used. |
| 13 |
SCTS |
IN |
Secondary Clear to send. Only needed if second channel being used. |
| 14 |
STD |
OUT |
Secondary Transmit Data. Only needed if second channel being used. |
| 15 |
DB |
OUT |
Transmit Clock (a.k.a TCLK, TxCLK). Synchronous use only. |
| 16 |
SRD |
IN |
Secondary Receive Data. Only needed if second channel being used. |
| 17 |
DD |
IN |
Receive Clock (a.k.a. RCLK). Synchronous use only. |
| 18 |
LL |
- |
Local Loopback |
| 19 |
SRTS |
OUT |
Secondary Request to Send. Only needed if second channel being used. |
| 20 |
DTR |
OUT |
Data Terminal Ready. (ASYNC) |
| 21 |
RL/SQ |
- |
Signal Quality Detector/Remote loopback |
| 22 |
RI |
IN |
Ring Indicator. DCE (Modem) raises when incoming call detected used for auto answer applications. |
| 23 |
CH/CI |
OUT |
Signal Rate selector. |
| 24 |
DA |
- |
Auxiliary Clock (a.k.a. ACLK). Secondary Channel only. |
| 25 |
- |
- |
Unassigned |
RS232 DB9(EIA/TIA 574)
DB9: View looking into male connector
DB9: View looking into female connector
| Pin No. |
Name |
Dir |
Notes/Description |
| 1 |
DCD |
IN |
Data Carrier Detect. Raised by DCE when modem synchronized. |
| 2 |
RD |
IN |
Receive Data (a.k.a RxD, Rx). Arriving data from DCE. |
| 3 |
TD |
OUT |
Transmit Data (a.k.a TxD, Tx). Sending data from DTE. |
| 4 |
DTR |
OUT |
Data Terminal Ready. Raised by DTE when powered on. In auto-answer mode raised only when RI arrives from DCE. |
| 5 |
SGND |
- |
Ground |
| 6 |
DSR |
IN |
Data Set Ready. Raised by DCE to indicate ready. |
| 7 |
RTS |
OUT |
Request To Send. Raised by DTE when it wishes to send. Expects CTS from DCE. |
| 8 |
CTS |
IN |
Clear To Send. Raised by DCE in response to RTS from DTE. |
| 9 |
RI |
IN |
Ring Indicator. Set when incoming ring detected - used for auto-answer application. DTE raised DTR to answer. |
출처 : http://www.zytrax.com/tech/layer_1/cables/tech_rs232.htm
DB9 <-> DB25 변환 및 RS-232 <-> RJ-45 변환, 신호 규격은 위 사이트 참조.
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