Information courtesy Telebyte, Inc.
| RS-232 DB-9 Interface (PC COM Port) |
| 
|
| Pin |
Signal |
Pin |
Signal |
| 1 |
Data Carrier Detect |
6 |
Data Set Ready |
| 2 |
Received Data |
7 |
Request to Send |
| 3 |
Transmitted Data |
8 |
Clear to Send |
| 4 |
Data Terminal Ready |
9 |
Ring Indicator |
| 5 |
Signal Ground |
|
|
| RS-232 DB-25 Interface |
| RS-232 (EIA Std.)
applicable to the 25 pin interconnection of Data Terminal
Equipment (DTE) and Data Communications Equipment (DCE)
using serial binary data. |
| Pin |
Signal |
EIA CKT |
From DCE |
To DCE |
| 1 |
Frame Ground |
AA |
|
|
| 2 |
Transmitted Data |
BA |
|
D (Data) |
| 3 |
Received Data |
BB |
D |
|
| 4 |
Request to Send |
CA |
|
C (Control) |
| 5 |
Clear to Send |
CB |
C |
|
| 6 |
Data Set Ready |
CC |
C |
|
| 7 |
Signal Gnd/Common Return |
AB |
|
|
| 8 |
Rcvd. Line Signal Detector |
CF |
C |
|
| 11 |
Undefined |
|
|
|
| 12 |
Secondary Rcvd. Line Sig. Detector |
SCF |
C |
|
| 13 |
Secondary Clear to Send |
SCB |
C |
|
| 14 |
Secondary Transmitted Data |
SBA |
|
D |
| 15 |
Transmitter Sig. Element Timing |
DB |
T (Timing) |
|
| 16 |
Secondary Received Data |
SBB |
D |
|
| 17 |
Receiver Sig. Element Timing |
DD |
T |
|
| 18 |
Undefined |
|
|
|
| 19 |
Secondary Request to Send |
SCA |
|
C |
| 20 |
Data Terminal Ready |
CD |
|
C |
| 21 |
Sig. Quality Detector |
CG |
|
C |
| 22 |
Ring Indicator |
CE |
C |
|
| 23 |
Data Sig. Rate Selector (DCE) |
CI |
|
C |
| 24 |
Transmitter Sig. Element Timing |
DA |
|
T |
| 25 |
Undefined |
|
|
|
|