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
Received on Mon Mar 13 2000 - 01:39:41 GMT