Interface Pinout Collection

Serial interfaces Signal Name / Mnemonic; V.35 EIA/RS 449 EIA/RS 530 RS 232 RS 232 Shield A 1 1 1   Signal Ground B 19 7 7 5 Data Terminal ready (DTR A) H 12 20 20 4 Data Set Ready (DSR A) E 11 6 6 6 Carrier Detect (DCD A) F 13 8 8 1 Request to Send (RTS A) C 7 4 4 7 Clear To Send (CTS A) D 9 5 5 8 Transmit Data (TXD A) P 4 2 2 3 Transmit Timing (TXC A) Y 5 15 15   Receive Data (RXD A) R 6 3 3 2 Receive Timing (RXC A) V 8 17 17   Terminal Timing (TT A) U 17 24 24   Data Terminal ready (DTR B)   30 23     Data Set Ready (DSR B)   29 22     Carrier Detect (DCD B)   31 10     Request To Send (RTS B)   25 19 19   Clear To Send (CTS B)   27 13 13   Transmit Data (TXD B) S 22 14 14   Transmit Timing (TXC B) AA 23 12     Receive Data (RXD B) T 24 16 16   Receive Timing (RXC B) X 26 9     Terminal Timing (TT B) W 35 11     Local Loopback (LL) L, K 10 18     Remote Loopback (RLB) N 14 21     Loss of Sync (LOS)(Unbalanced)   36       Loss of Sync (LOS A)   3       Loss of Sync (LOS B)   21       SCSI Single End Signal Name /Mnemonic DB25* ID50 CN50 DM50 DM68 D0 8 2 26 26 40 D1 21 4 27 27 41 D2 22 6 28 28 42 D3 10 8 29 29 43 D4 23 10 30 30 44 D5 11 12 31 31 45 D6 12 14 32 32 46 D7 13 16 33 33 47 D8         65 D9         66 D10         67 D11         68 D12         35 D13         36 D14         37 D15         38 DParity 20 18 34 34 48 DParityH         39 Terminator Power 25 26 38 38 17, 18, 51, 52 ATN 17 32 41 41 55 BSY 6 36 43 43 57 ACK 5 38 44 44 58 RST 4 40 45 45 59 MSG 2 42 46 46 60 SEL 19 44 47 47 61 C/D 15 46 48 48 62 REQ 1 48 49 49 63 I/O 3 50 50 50 64 Ground 7, 9, 14, 16, 18, 24 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 49, 50, 54, 56 *Some older equipment with DB25s will have a different pinout, but all Apple equipment followed this pinout SCSI Differential Signal Name /Mnemonic ID50 CN50 DM50 DM68 D0+ 3 2 2 7 D0- 4 27 27 41 D1+ 5 3 3 8 D1- 6 28 28 42 D2+ 7 4 4 9 D2- 8 29 29 43 D3+ 9 5 5 10 D3- 10 30 30 44 D4+ 11 6 6 11 D4- 12 31 31 45 D5+ 13 7 7 12 D5- 14 32 32 46 D6+ 15 8 8 13 D6- 16 33 33 47 D7+ 17 9 9 14 D7- 18 34 34 48 D8+       31 D8-       65 D9+       32 D9-       66 D10+       33 D10-       67 D11+       34 D11-       68 D12+       1 D12-       35 D13+       2 D13-       36 D14+       3 D14-       37 D15+       4 D15-       38 DParity+ 19 10 10 15 DParity- 20 35 35 49 DParityH+       5 DParityH-       39 Terminator Power 26 38 38 52 ATN+ 29 15 15 20 ATN- 30 40 40 54 BSY+ 33 17 17 22 BSY- 34 42 42 56 ACK+ 35 18 18 23 ACK- 36 43 43 57 RST+ 37 19 19 24 RST- 38 44 44 58 MSG+ 39 20 20 25 MSG- 40 45 45 59 SEL+ 41 21 21 26 SEL- 42 46 46 60 C/D+ 43 22 22 27 C/D- 44 47 47 61 REQ+ 45 23 23 28 REQ- 46 48 48 62 I/O+ 47 24 24 29 I/O- 48 49 49 63 Ground 2, 22, 23, 24, 27, 28, 31, 32, 49, 50 12, 14, 16, 25, 26, 36, 37, 39, 41, 50 12, 14, 16, 25, 26, 36, 37, 39, 41, 50 17, 19, 21, 30, 31, 50, 51, 53, 56, 64

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