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Software Vault: The Gold Collection
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CABLES.TXT
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1993-04-13
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3KB
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63 lines
CABLE DIAGRAMS FOR IBM AND SIMILAR COMPUTERS
Standard RS - 232 Modem Cable
DB-25 to DB-25 25 to 25 Pin
Terminal (DTE) Modem (DCE)
---- ----
GND | 1 | <---------> | 1 | GND
TxD | 2 |-----------> | 2 | TxD
RxD | 3 | <-----------| 3 | RxD
RTS | 4 |-----------> | 4 | RTS
CTS | 5 | <-----------| 5 | CTS
DSR | 6 | <-----------| 6 | DSR
GND | 7 | <---------> | 7 | GND
DCD | 8 | <-----------| 8 | DCD
DTR | 20 |-----------> | 20 | DTR
---- ----
DB-9 to DB-25 9 to 25 Pin
Terminal (DTE) Modem (DCE)
---- ----
TxD | 3 |-----------> | 2 | TxD
RxD | 2 | <---------> | 3 | RxD
RTS | 7 |-----------> | 4 | RTS
CTS | 8 | <-----------| 5 | CTS
DSR | 6 | <-----------| 6 | DSR
GND | 5 | <---------> | 7 | GND
DCD | 1 | <-----------| 8 | DCD
DTR | 4 |-----------> | 20 | DTR
RNG | 9 | <-----------| 22 | RNG
---- ----
CABLE DIAGRAM FOR MACINTOSH COMPUTERS
RS-232 DIN 8 (MAC) Supra Modem With Hardware Handshake
----- ------
DTR HSKo | 1 |----------------> | 20 |--+ DTR
CTS HSKi | 2 | <----------------| 5 | | CTS
TxD TxD- | 3 |----------------> | 2 | | TxD
GND GND +--| 4 | <--------------> | 7 | | GND
RxD RxD- | | 5 | <----------------| 3 | | RxD
N.A. TxD+ | | 6 |---nc nc---| 6 | | DSR
N.A. DEAD | | 7 |---nc nc---| 8 | | DCD
N.A. RxD+ +--| 8 | nc---| 1 | | GND
----- | 4 |--+ RTS
------
Note: Pins 4 & 8 are hooked together on the MAC side, and also connect to
pin 7 on the Modem side. Pins 4 & 20 are hooked together on the
Modem side, and also connect to pin 1 on the MAC side.
Lines on DB25 port (DB9 port)
Pin # Mnemonic Description
1 (NC) GND Protective frame ground
2 (3) TxD Transmit Data
3 (2) RxD Receive Data
4 (7) RTS Request to Send
5 (8) CTS Clear to Send
6 (6) DSR Data Set Ready
7 (5) GND Reference signal ground
8 (1) DCD Data Carrier Detect
20 (4) DTR Data Terminal Ready
22 (9) RNG Ring Indicator