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From: Cyrus Roton <croton@ridgecrest.ca.us>
Subject: Apple and Mac ports, pinouts
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The subject comes up so often that I offer the following to help whoever
needs the info:
The following is a list of Apple Serial Connector Pin Assignments, as well as a chart listing the major Apple cables. The information was presented in the A+ magazine, June 1986, The Right Connections, by Brian Cutter. I do not guarantee the accuracy
of this information.
APPLE PIN ASSIGNMENTS
Listing the pin assignments and signal names of Apple computer and peripheral connectors. Pins not listed are not connected, unless otherwise noted.
A. RS-232 Interfaces
SUPER SERIAL CARD -- DB25
1 Fame Ground
2 Transmit Data (TXD)
3 Receive Data (RXD)
4 Request to Send (RTS)
5 Clear to Send (CTS)
6 Data Set Ready (DSR)
7 Signal Ground (GND)
8 Data Carrier Detect (DCD)
19 Secondary Clear to Send (SCTS)
20 Data Terminal Ready (DTR)
Note: This assumes that the "jumper block" is in the MODEM position. For signal to pin configuration with the block in the TERMINAL position, refer to the SSC Operator Manual.
APPLE //C SERIAL PORTS (both) -- DIN 5-pin
1 Data Terminal Ready (DTR)
2 Transmit Data (TXD)
3 Signal Ground (GND)
4 Receive Data (RXD)
5 Data Set Ready (DSR)
APPLE MODEM 300/1200 -- DB9
2 Data Set Ready (DSR)
3 Signal Ground (GND)
5 Receive Data (RXD)
6 Data Terminal Ready (DTR)
7 Data Carrie Detect (DCD)
8 Frame Ground
9 Transmit Data (TXD)
APPLE PERSONAL MODEM -- Mini-DIN 8-pin
1 Data Set Ready (DSR)
2 Data Terminal Ready (DTR)
3 Receive Data (RXD)
4 Signal Ground (GND)
5 Transmit Data (TXD)
6 Signal Ground (GND)
7 Data Carrier Detect (DCD)
LASERWRITER -- DB25
(See RS-422 section below for LaserWriter
DB-9 Connector)
1 Frame Ground
2 Transmit Data (TXD)
3 Receive Data (RXD)
4 Ready to Send (RTS)
7 Signal Ground (GND)
20 Data Terminal Ready (DTR)
IMAGEWRITER I -- DB25
(See RS-422 section below for ImageWriter II Connector)
1 Frame Ground
2 Transmit Data (TXD)
3 Receive Data (RXD)
4 Request to Send (RTS)
7 Signal Ground (GND)
14 Fault
20 Data Terminal Ready (DTR)
APPLE SCRIBE PRINTER -- DB25
1 Frame Ground
2 Transmit Data (TXD)
3 Receive Data (RXD)
4 Request to Send (RTS)
7 Signal Ground (GND)
20 Data Terminal Ready (DTR)
APPLE DAISYWHEEL PRINTER -- DB25
1 Frame Ground
2 Transmit Data (TXD)
3 Receive Data (RXD)
4 Request to Send (RTS)
5 Clear to Send (CTS)
6 Data Set Ready (DSR)
7 Signal Ground (GND)
8 Data Carrier Detect
20 Data Terminal Ready (DTR)
B. RS-422 INTERFACE
MACINTOSH SERIAL PORTS -- DB9
(Old Mac 128/512)
1 Frame Ground
2 +5V *See note below
3 Signal Ground (GND)
4 Tansmit Data (TXD+)
5 Transmit Data (TXD-)
6 +12V *See note below
7 Handshake
8 Receive Data (RXD+)
9 Receive Data (RXD-)