This document describes the pinout configurations for RS-232 and RJ45 serial communication interfaces. It lists the pin assignments for signals such as Transmitted Data, Received Data, Request To Send, Clear To Send, Data Set Ready, Signal Ground, Data Carrier Detect, Data Terminal Ready, and Ring Indicator. Secondary signals are also defined for certain pins. The pinout is shown for connecting a PC running as data terminal equipment to a modem functioning as data communication equipment.

1. N7
N6
N5
N4
N3
N2
N1
Aplicación
Físico
Enlace
Red
Transporte
Sesión
Presentación

3. •
•

6. 25 PINES 9 PINES
Hembra Macho
Hembra Hembra
Macho Macho
Macho Hembra

8. Circuit Circuit
EIA CCITT
1 Shield Ground AA
7 Signal Ground AB 102 4 5
2 Transmitted Data BA 103 6 3
3 Received Data BB 104 5 2
4 Request To Send CA 105 8 7
5 Clear To Send CB 106 7 8
6 DCE Ready CC 107 1 6
20 DTE Ready CD 108.2 3 4
22 Ring Indicator CE 125 1 9
8
Received Line Signal
Detector CF 109 2 1
Data Signal Rate Select
(DTE/DCE Source>Transmit Signal Element
Timing
(DTE Source)Transmitter Signal
Element Timing
(DCE Source)Receiver Signal Element
Timing
(DCE Source)
18
Local Loopback / Quality
Detector LL 141
21 Remote Loopback RL/CG 140/110
14
Secondary Transmitted
Data SBA 118
16
Secondary Received
Data SBB 119
19
Secondary Request To
Send SCA 120
13
Secondary Clear To
Send SCB 121Secondary Received
Line Signal Detector/Data signal Rate Select
(DCE Source)
25 Test Mode TM 142
9 Reserved for Testing
10 Reserved for Testing
11 Unassigned
12 SCF/CI 122/112
17 DD 115
15 DB 114
24 DA 113
23 CH/CI 111/112
RS232-C Description RJ45 TIA 457

9. V1
V2

14. TD
RD
RTS
CTS
DSR
SGN
DCD
DTR
RI
2
3
4
5
6
7
8
20
22
PC
(DTE)
Modem
(DCE)
2
3
4
5
6
7
8
20
22

23. 2 RXD
3 TXD
5 SGN
DB 9
-
+
Linea en silencio : estado alto