Here are Apple Serial NB Card D-62 Connector Pinouts. There are two types of cables, the Hydra cable with four RS-232-C connectors, and the V.35 cable with one RS-232-C connector and one V.35 connector.
The term "RS-232" as used here refers to a signal that is single-ended and driven between +/-12V.
The terms "RS-422" and "X.21" as used here refer to a signal that is differential and driven +/-, measured differentially.
Pin # Signal Function
----- ------ ---------
1 +CA1F X.21 Control, +CHA1, OUTPUT
3 -CA1F X.21 Control, -CHA1, OUTPUT
6 +CB1F X.21 Control, +CHB1, OUTPUT
8 -CB1F X.21 Control, -CHB1, OUTPUT
16 +IA1 X.21 INDICATION, +CHA1, INPUT
44 1DCDA/-IA1 RS-232 Data Carrier Detect/X.21 INDICATION, -CHA1, INPUT
11 +IB1 X.21 INDICATION, +CHB1, INPUT
49 1DCDB/-IB1 RS-232 Data Carrier Detect/X.21 INDICATION, -CHB1, INPUT
62 GND_1 CHA1 GND
57 GND_2 CHB1 GND
52 GMD_3 CHA2 GND
47 GND_4 CHB2 GND
41 GND_5 EXTRA GND
37 GND_6 EXTRA GND
2 232TXDA1 TX DATA, CHA1, RS-232, OUTPUT
7 232TXDB1 TX DATA, CHB1, RS-232, OUTPUT
12 232TXDA2 TX DATA, CHA2, RS-232, OUTPUT
17 232TXDB2 TX DATA, CHB2, RS-232, OUTPUT
4 1RTSA READY TO SEND, CHA1, RS-232, OUTPUT
9 1RTSB READY TO SEND, CHB1, RS-232, OUTPUT
14 2RTSA READY TO SEND, CHA2, RS-232, OUTPUT
19 2RTSB READY TO SEND, CHB2, RS-232, OUTPUT
5 1CTSA CLEAR TO SEND, CHA1, RS-232, INPUT
10 1CTSB CLEAR TO SEND, CHB1, RS-232, INPUT
15 2CTSA CLEAR TO SEND, CHA2, RS-232, INPUT
20 2CTSB CLEAR TO SEND, CHB2, RS-232, INPUT
43 1DSRA DATA SET READY, CHA1, RS-232, INPUT
48 1DSRB DATA SET READY, CHB1, RS-232, INPUT
53 2DSRA DATA SET READY, CHA2, RS-232, INPUT
58 2DSRB DATA SET READY, CHB2, RS-232, INPUT
45 1DTRA DATA TERMINAL READY, CHA1, RS-232, OUTPUT
50 1DTRB DATA TERMINAL READY, CHB1, RS-232, OUTPUT
55 2DTRA DATA TERMINAL READY, CHA2, RS-232, OUTPUT
60 2DTRB DATA TERMINAL READY, CHB2, RS-232, OUTPUT
46 1RIA RING INDICATOR, CHA1, RS-232, INPUT
51 1RIB RING INDICATOR, CHB1, RS-232, INPUT
56 2RIA RING INDICATOR, CHA2, RS-232, INPUT
61 2RIB RING INDICATOR, CHB2, RS-232, INPUT
54 2DCDA DATA CARRIER DETECT, CHA2, RS-232, INPUT
59 2DCDB DATA CARRIER DETECT, CHB2, RS-232, INPUT
39 2RXCA RECEIVE CLOCK, CHA2, RS-232, INPUT
40 2RXCB RECEIVE CLOCK, CHB2, RS-232, INPUT
38 2TXCA TRANSMIT CLOCK, CHA2, RS-232, INPUT
42 2TXCB TRANSMIT CLOCK, CHB2, RS-232, INPUT
13 2TXDA RECEIVE DATA, CHA2, RS-232, INPUT
18 2TXDB RECEIVE DATA, CHB2, RS-232, INPUT
21 +422TXCA1 +TRANSMIT CLOCK, CHA1, RS-422, INPUT
22 -422TXCA1 -TRANSMIT CLOCK, CHA1, RS-422, INPUT
29 +422TXCB1 +TRANSMIT CLOCK, CHB1, RS-422, INPUT
30 -422TXCB1 -TRANSMIT CLOCK, CHB1, RS-422, INPUT
25 +422RXCA1 +RECEIVE CLOCK, CHA1, RS-422, INPUT
26 -422RXCA1 -RECEIVE CLOCK, CHA1, RS-422, INPUT
33 +422RXCB1 +RECEIVE CLOCK, CHB1, RS-422, INPUT
34 -422RXCB1 -RECEIVE CLOCK, CHB1, RS-422, INPUT
27 +422TXDA1 +TRANSMIT DATA, CHA1, RS-422, OUTPUT
28 -422TXDA1 -TRANSMIT DATA, CHA1, RS-422, OUTPUT
35 +422TXDB1 +TRANSMIT DATA, CHB1, RS-422, OUTPUT
36 -422TXDB1 -TRANSMIT DATA, CHB1, RS-422, OUTPUT
23 +422RXDA1 +RECEIVE DATA, CHA1, RS-422, INPUT
24 -422RXDA1 -RECEIVE DATA, CHA1, RS-422, INPUT
31 +422RXDB1 +RECEIVE DATA, CHB1, RS-422, INPUT
32 -422RXDB1 -RECEIVE DATA, CHB1, RS-422, INPUT