A diferença básica entre o padrão CCITT V.24 e o padrão EIA RS-232 consiste apenas na designação da pinagem do conector DB-25.
A tabela a seguir apresenta:
___________________________________________________________________PINO RS-232 V.24 FONTE ABREV. DESCRIÇÃO
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1 AA 101 AMBOS PG Protective Ground
2 BA 103 ETD TD Transmitted Data
3 BB 104 ECD RD Received Data
4 CA 105 ETD RTS Request to Send
5 CB 106 ECD CTS Clear to Send
6 CC 107 ECD DSR Data Set Ready
7 AB 102 AMBOS SG Signal Ground
8 CF 109 ECD CD Carrier Detect
9 - - - - Reservado para teste do modem
10 - - - - Reservado para teste do modem
11 - - - - Livre
12 SCF 122 ECD SCD Sec. Rec.Signal Detect
13 SCB 121 ECD SCT Sec. Clear to Send
14 SBA 118 ETD STD Sec. Transmitted Data
15 DB 114 ECD ST Transmit Timing
16 SBB 119 ECD SRD Sec. Received Data
17 DD 115 ECD RT Received Timing
18 - - - - Livre
19 SCA 120 ETD SRT Sec. Request to Send
20 CD 108.2 ETD DTR Data Terminal Ready
21 CG 110 QUALQUER SQD Signal Quality Detector
22 CE 125 ECD RI Ring Indicator
23 CH/CI 111 QUALQUER DRD Data Rate Detector
24 DA 113 ETD ST Transmit Timing
25 - - - - Livre
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