Macintosh Serial Port Pinouts - ZyXEL Communications U-336R/RE User Manual

Signa
l Pin

Macintosh Serial Port Pinouts

The following table shows the wiring of a modem Macintosh
hardware handshaking cable:
Mac
Din 8
1
2
3
4
5
6
7
8
ITU-TSS
Signal
Name
22 125
24 113
25 142
Modem Description
DB 25
4 & 20 DTR to RTS and DTR, Hardware
Handshaking Out
5 CTS to CTS, Hardware Handshaking In
2 TX- to TXD, Data sent
7 GND, Ground
3 RX- to RXD, Data received
- not connected
8 GPI to CD, Carrier detected
7 GND, Ground, needed for RS-232
connections
EIA Pin/Signal
Signal Description
Name
Loop Test.
CE Ring
Indicator(RI).
DA Transmit Clock
Signal (source:
DTE).
Test Indicator.
Direction
DTE-
DCE
Terminal Pinouts 135