Cable Pin-Outs

 

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Telecommunications Interface Pin-out Configurations

(Choicecomm will not be responsible for any damage resulting from the use of any information on this page that is incorrect or has been revised by the industry)

DB25 (RS232, V.24) Standard Serial Pin-out

DB9 (PC Interface) Serial Pin-out 

RJ45 (RS232, V.24) Serial Pin-out

Apple Macintosh Serial

DB37 (RS-449) Serial Pin-out

DB9 Secondary Channel Pin-out

DB25 Serial Pin-out: EIA 530

M/34 (V.35) Serial Pin-out

DB15 (X.21, V.24) Standard Serial Pin-out

 

 

 

 

DB25 Standard Serial Pinout: EIA-232-D (RS-232-D), ITU-TSS (CCITT) V.24/V.28, ISO 2110

Male DB25

Female DB25
Pin Signal Name Abbreviation Signal Function/ Direction
1 Shield SHD Ground
2 Transmitted Data TD Data, to DCE
3 Received Data RD Data, from DCE
4 Request to Send RTS Control, to DCE
5 Clear to Send CTS Control, from DCE
6 DCE Ready DCR Control, from DCE
7 Signal Ground SGND Ground
8 Received Line Signal Detector RLSD Control, from DCE
9 +12 VDC Reserved for Testing    
10 -12 VDC Reserved for Testing    
11 Unassigned    
12 Secondary Received Line Signal Detector SRLSD Control, from DCE
or
12 Data Signal Rate Selector DSRSC Control, from DCE
13 Secondary Clear to Send SCTS Control, from DCE
14 Secondary Transmit Data STD Data, to DCE
15 Transmitter Signal Element Timing TSETC Timing, from DCE
16 Secondary Receive Data SRD Data, from DCE
17 Receiver Signal Element Timing RSETC Timing, from DCE
18 Local Loopback LL Control, to DCE
19 Secondary Request to Send SRTS Control, to DCE
20 DTE Ready DTR Control, to DCE
21 Remote Loopback RL Control, to DCE
or
21 Signal Quality Detector SQD Control, from DCE
22 Ring Indicator RI Control, from DCE
23 Data Signal Rate Selector DSRST Control, to DCE
or
23 Data Signal Rate Selector DSRSC Control, from DCE
24 Transmitter Signal Element Timing TSETT Timing, to DCE
25 Test Mode TM Control, from DCE

 

DB9 Serial Pinout for IBM AT and compatible computers: EIA/TIA-574

Male DB9

Female DB9
Pin Signal Name Abbreviation Signal Function/ Direction
1 Received Line Signal Detector RLSD Control, from DCE
2 Received Data RD Data, from DCE
3 Transmitted Data TD Data, to DCE
4 DTE Ready DRT Control, to DCE
5 Signal Ground SGND Ground
6 DCE Ready DCR Control, from DCE
7 Request to Send RTS Control, to DCE
8 Clear to Send CTS Control, from DCE
9 Ring Indicator RI Control, from DCE

 

RJ45 Serial Pinout: EIA/TIA-561 (ANSI/EIA-232-D)

Male RJ-45 (Plug)

Female RJ-45 (Socket)
Pin Signal Name Abbreviation Signal Function/ Direction
1 DCE Ready DCR Control, from DCE
or
1 Ring Indicator RI Control, from DCE
2 Received Line Signal Detector RLSD Control, from DCE
3 DTE Ready DTR Control, to DCE
4 Signal Ground SGND Ground
5 Received Data RD Data, from DCE
6 Transmitted Data TD Data, to DCE
7 Clear to Send CTS Control, from DCE
8 Request to Send RTS Control, to DCE

 

Apple Macintosh Serial

Male MiniDin8

Female MiniDin8
Pin Signal Name Abbreviation Signal Function/ Direction
1 Handshake Output (DTR) HSKo, +12V Control, to DCE
2 Handshake Input (DSR) HSKG Control, from DCE
3 Transmitted Data (Minus) TXD- Data, to DCE
4 Signal Ground GND Ground
5 Received Data (Minus) RXD- Data, from DCE
6 Transmitted Data (Plus) TXD+ Data, to DCE
7 Unassigned    
8 Received Data (Plus) RXD+ Data, from DCE

 

DB37 Serial Pinout: EIA-449 (RS-449), ISO 4902

Male DB37

Female DB37
Pin Signal Name Signal Function/ Direction
1 Shield Ground
2 Signal Rate Indicator Control, from DCE
3 Unassigned  
4 Send Data A Data, to DCE
5 Send Timing A Timing, from DCE
6 Reveive Data A Data, from DCE
7 Request to Send A Control, to DCE
8 Reveive Timing A Timing, from DCE
9 Clear to Send A Control, from DCE
10 Local Loopback Control, to DCE
11 Data Mode A Control, from DCE
12 Terminal Ready A Control, to DCE
13 Reveiver Ready A Control, from DCE
14 Remote Loopback Control, to DCE
15 Incoming Call Control, from DCE
16 Select Frequency Control, from DCE
17 Terminal Timing A Timing, to DCE
18 Test Mode Control, from DCE
19 Signal Ground Ground
20 Reveive Common Ground
21 Unassigned  
22 Send Data B Data, to DCE
23 Send Timing B Timing, from DCE
24 Receive Data B Data, from DCE
25 Request to Send B Control, to DCE
26 Receive Timing B Timing, from DCE
27 Clear to Send B Control, from DCE
28 Terminal in Service Control, to DCE
29 Data Mode B Control, from DCE
30 Terminal Ready B Control, to DCE
31 Reveiver Ready B Control, from DCE
32 Select Standby Control, to DCE
33 Signal Quality Control, from DCE
34 New Signal Control, to DCE
35 Terminal Timing B Timing, to DCE
36 Standby Indicator Control, from DCE
37 Send Common Ground

 

DB9 Secondary Channel Pinout

Male DB9

Female DB9
Pin Signal Name

Abbreviation

 Signal Function/ Direction
1 Shield AA Ground
2 Secondary Reveiver Ready SRR Control, from DCE
3 Secondary Send Data SSD Data, to DCE
4 Secondary Receive Data SRD Data, from DCE
5 Signal Ground SG Ground
6 Reveive Common RC Ground
7 Secondary Request to Send SRS Control, to DCE
8 Secondary Clear to Send SCS Control, from DCE
9 Send Common SC Ground

 

DB25 Serial Pinout: EIA-530 (RS-530)

Male DB25

Female DB25
Pin Signal Name Abbreviation Signal Function/ Direction
1 Shield SHD Ground
2 Transmitted Data A TD A Data, to DCE
3 Received Data A RD A Data, from DCE
4 Request to Send A RTS A Control, to DCE
5 Clear to Send A CTS A Control, from DCE
6 DCE Ready A DCR A Control, from DCE
7 Signal Ground SGND Ground
8 Received Line Signal Detector A RLSD A Control, from DCE
9 Receiver Signal Element Timing (DCE Source) B RSETC B Timing, from DCE
10 Received Line Signal Detector B RLSD B Control, from DCE
11 Transmitter Signal Element Timing (DTE Source) B TSETT B Timing, to DCE
12 Transmitter Signal Element Timing (DCE Source) B TSETC B Timing, from DCE
13 Clear to Send B CTS B Control, from DCE
14 Transmitted Data B TD B Data, to DCE
15 Transmitter Signal Element Timing (DCE Source) A TSETC A Timing, from DCE
16 Reveived Data B RD B Data, from DCE
17 Receiver Signal Element Timing (DCE Source) A RSETC A Timing, from DCE
18 Local Loopback LL Control, to DCE
19 Request to Send B RTS B Control, to DCE
20 DTE Ready A DTR A Control, to DCE
21 Remote Loopback RL Control, to DCE
22 DCE Ready B DCR B Control, from DCE
23 DTE Ready B DTR B Control, to DCE
24 Transmitter Signal Element Timing (DTE Source) A TSETT A Timing, to DCE
25 Test Mode TM Control, from DCE

 

M/34 (V.35) Serial Pinout: ITU-TSS (CCITT) V.35

Pinning

M/34 Male M/34 Female
M/34 Male M/34 Female

 

Pin Signal Abbr. DTE DCE
A Chassis Ground   - -
B Signal Ground   - -
C Request To Send RTS Out In
D Clear To Send CTS In Out
E Data Set Ready DSR In Out
F Data Carrier Detect DCD In Out
H Data Terminal Ready DTR Out In
J Local Loopback LL In Out
K Local Test   Out In
L Unassigned
M Unassigned
N Unassigned
P Send Data A TxD- Out In
R Receive Data A RxD- In Out
S Send Data B TxD+ Out In
T Receive Data B RxD+ In Out
U Terminal Timing A   Out In
V Receive Timing A   In Out
W Terminal Timing B   Out In
X Receive Timing B   In Out
Y Send Timing A   In Out
Z Unassigned
AA Send Timing B   In Out
BB Unassigned
CC Unassigned
DD Unassigned
EE Unassigned
FF Unassigned
HH Unassigned
JJ Unassigned
KK Unassigned
LL Unassigned
MM Unassigned
NN Unassigned

 

X.21/V.24 Pinout

 

Male DB15

Female DB15

Pin Signal Name Signal Direction
1 Shield Ground
2 Transmit A Data, to DCE
3 Control A Control, to DCE
4 Receive A Data, from DCE
5 Indication A Control, from DCE
6 Signal Element Timing A Timing, from DCE
7 Byte Timing A Timing, from DCE
8 Signal Ground Ground
9 Transmit B Data, to DCE
10 Control B Control, to DCE
11 Receive B Data, from DCE
12 Indication B Control, from DCE
13 Signal Element Timing B Timing, from DCE
14 Byte Timing B Timing, from DCE