12 Mar
2000
12 Mar
'00
5:39 p.m.
On Mar 12, 19:09, Aaron Christopher Finney wrote:
No extra cable...but I do have the RS422 standard
pinout handy, this is
the one I used to make my null-modem cable:
Pin Function
------------------
1 handshake out (DTR?)
2 handshake in (RTS?)
3 TD-
4 GND
5 RD-
6 TD+
7 GPinput (carrier detect)
8 RD+
Almost right -- pin 2 is CTS not RTS:
Pin Function
------------------
1 HSKo (DTR)
2 HSKi (CTS)
3 TxD-
4 GND
5 RxD-
6 TxD+
7 GPi (DCD)
8 RxD+
For a Mac-to-Newton cable, the interconnections are:
Ground (4) -> Ground (4) (also connect to connectors' shrouds)
Transmit+ (6) -> Receive+ (8)
Transmit- (3) -> Receive- (5)
Receive+ (8) -> Transmit+ (6)
Receive- (5) -> Transmit- (3)
Data Term Ready (1) -> Clear To Send (2)
Clear To Send (2) -> Data Term Ready (1)
--
Pete Peter Turnbull
Dept. of Computer Science
University of York