
Serial Port Interface 153
Pin
Number
ITU-TSS
Signal
Name
EIA
Signal
Name
Signal/Pin
Description
Signal
Direction
DTE -DCE
Test.
22 125 CE Ring Indicator(RI).
⇐
24 113 DA Transmit Clock
Signal (source:
DTE).
⇒
25 142 Test Indicator.
⇐
Async. Hardware Flow Control Cable Connection
Modem to PC to DCE to to NeXT
(DCE) Signal (DTE) (Null) MAC 68,040
DB25 DB 9 DB25 Mini 8 Mini 8
2 TXD 3 3 3 3
3 RXD 2 2 5 5
4 RTS 7 5 1 6
5 CTS 8 4 2 8
6 DSR 6 20
7 Ground 5 7 4,8 4
8 CD (DCD) 1 20 2
20 DTR 4 6,8 1 1
22 RI 9
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