[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Null modem pinout
Had those pinouts somewhere, hold on...
This is from Apple Oasis. (A plug for Teodor, the author)
This should work for you. Teodor also includes a program which works as an
Apple disk server for IIE machines. Couldn't get it to work on my //c though.
Different joystick ports.
The null modem connection is a short cable and two connectors. The standard
serial connectors are DB-25 and DB-9. Following are their pin descriptions:
DB-9 Connector
Pin Signal Pin Signal
-------------------------------------------------------------------
1 CD Carrier Detect 6 DSR Data Set Ready
2 RXD Receive Data 7 RTS Request to Send
3 TXD Transmit Data 8 CTS Clear to Send
4 DTR Data Term. Ready 9 RI Ring Indicator
5 GND Signal GND
DB-25 Connector
Pin Signal Pin Signal
-------------------------------------------------------------------
1 GND Ground / Shield 14 {2nd TXD}
2 TXD Transmit Data 15 Transmit Clock
3 RXD Received Data 16 {2nd Rec. Clock}
4 RTS Request to Send 17 {Receive Clock}
5 CTS Clear to Send 18 {Unassigned}
6 DSR Data Set Ready 19 {2nd RTS}
7 GND Ground 20 DTR Data Term Ready
8 DCD Carrier Detect 21 {Sig. Quality}
9 {Reserved} 22 RI Ring Indicator
10 {Reserved} 23 {Data Rate Sel.}
11 {Unassigned} 24 {Transmit Clock}
12 {2nd CD} 25 {Unassigned}
13 {2nd CTS}
Here is the Null Modem connection:
PC (DB-9) Apple*(DB-25)
RxD (2) ---------------------- TxD (2)
TxD (3) ---------------------- RxD (3)
GND (5) ---------------------- GND (7)
RTS (7) --\ /-- RTS (4)
CTS (8) --/ \-- CTS (5)
CD (1) --\ /-- DSR (6)
DSR (6) --+ +-- DTR (20)
DTR (4) --/ \-- CD (8)
* For Super Serial Card (SSC) put the TERMINAL/MODEM jumper pointing up at
'MODEM'.