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Pin Signal Description
1 +CA1F X.21 control, +CHA1, output
2 232TXDA1 Transmit data, CHA1, RS-232, output
3 -CA1F X.21 control, -CHA1, output
4 1RTSA Ready To Send, CHA1, RS-232, output
5 1CTSA Clear To Send, CHA1, RS-232, input
6 +CB1F X.21 control, +CHB1, output
7 232TXDB1 Transmit data, CHB1, RS-232, output
8 -CB1F X.21 control, -CHB1, output
9 1RTSB Ready To Send, CHB1, RS-232, output
10 1CTSB Clear To Send, CHB1, RS-232, input
11 +1B1 X.21 indication, +CHB1, input
12 232TXDA2 Transmit data, CHA2, RS-232, output
13 2RXDA Receive data, CHA2, RS-232, input
14 2RTSA Ready To Send, CHA2, RS-232, output
15 2CTSA Clear To Send, CHA2, RS-232, input
16 +IA1 X.21 indication, +CHA1, input
17 232TXDB2 Transmit data, CHB2, RS-232, output
18 2RXDB Receive data, CHB2, RS-232, input
19 2RTSB Ready To Send, CHB2, RS-232, output
20 2CTSB Clear To Send, CHB2, RS-232, input
21 +422TXCA1 +Transmit clock, CHA1, RS-422, input
22 -422TXCA1 -Transmit clock, CHA1, RS-422, input
23 +422RXDA1 +Receive data, CHA1, RS-422, input
24 -422RXDA1 -Receive data, CHA1, RS-422, input
25 +422RXCA1 +Receive clock, CHA1, RS-422, input
26 -422RXCA1 -Receive clock, CHA1, RS-422, input
27 +422TXDA1 +Transmit data, CHA1, RS-422, output
28 -422TXDA1 -Transmit data, CHA1, RS-422, output
Ports and Pinouts Apple Serial NB Card - 36
29 +422TXCB1 +Transmit clock, CHB1, RS-422, input
30 -422TXCB1 -Transmit clock, CHB1, RS-422, input
31 +422RXDB1 +Receive data, CHB1, RS-422, input
32 -422RXDB1 -Receive data, CHB1, RS-422, input
33 +422RXCB1 +Receive clock, CHB1, RS-422, input
34 -422RXCB1 -Receive clock, CHB1, RS-422, input
35 +422TXDB1 +Transmit data, CHB1, RS-422, output
36 -422TXDB1 -Transmit data, CHB1, RS-422, output
37 GND_6 Extra ground
38 2TXCA Transmit clock, CHA2, RS-232, input
39 2RXCA Receive clock, CHA2, RS-232, input
40 2RXCB Receive clock, CHB2, RS-232, input
41 GND_5 Extra ground
42 2TXCB Transmit clock, CHB2, RS-232, input
43 1DSRA Data Set Ready, CHA1, RS-232, input
44 1DCDA/-IA1 Data Carrier Detect, RS-232/X.21
indication, -CHA1, input
45 1DTRA Data Terminal Ready, CHA1, RS-232, output
46 1RIA Ring Indicator, CHA1, RS-232, input
47 GND_4 CHB2 ground
48 1DSRB Data Set Ready, CHB1, RS-232, input
49 1DCDB/-IB1 Data Carrier Detect, RS-232/X.21
indication, -CHB1, input
50 1DTRB Data Terminal Ready, CHB1, RS-232, output
51 1RIB Ring Indicator, CHB1, RS-232, input
52 GND_3 CHA2 ground
53 2DSRA Data Set Ready, CHA2, RS-232, input
54 2DCDA Data Carrier Detect, CHA2, RS-232, input
55 2DTRA Data Terminal Ready, CHA2, RS-232, output
56 2RIA Ring Indicator, CHA2, RS-232, input
57 GND_2 CHB1 ground
Pin Signal Name Signal Description
Ports and Pinouts Apple Serial NB Card - 37
58 2DSRB Data Set Ready, CHB2, RS-232, input
59 2DCDB Data Carrier Detect, CHB2, RS-232, input
60 2DTRB Data Terminal Ready, CHB2, RS-232, output
61 2RIB Ring Indicator, CHB2, RS-232, input
62 GND_1 CHA1 ground
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