Subject: Re: Help with null modem From: Rubywand Date: Wed, Jun 03, 1998 14€11 EDT Message-id: <357591EF.7C7B2473@swbell.net> Ronald Clark writes ... > > I am trying to transfer files from the win to the GS > but I can send for the win to the GS but I can send from the GS to the > win I am using Proterm 3.1 and the pin out are > 1-1 2-3 3-2 4-5 5-4 6-20 7-7 8-20 .... A NULL modem is, typically, two 25-pin female sockets (call them "A" and "B") wired back-to-back as follows ... Socket-A Socket-B 1 -> 1 2 -> 3 3 -> 2 4 & 5 -> 8 6 & 22 -> 20 7 -> 7 8 -> 4 & 5 20 -> 6 & 22 If you can find a couple old-style DIN-25 plug casings, the sockets can be mounted and the casings can be glue-gunned together to make a nice compact unit. For GS-PC (or Mac, etc.) transfers, you plug the modem cable from the GS into one side of the NULL modem and the modem cable from the PC into the other side. If the PC has a 9-pin serial port connector, use a 9-to-25 adaptor cable to connect to the NULL modem. Similarly, if the Mac cable has a special connector, use a converter to a male DB-25 connector for plugging into the NULL modem. If you want to run at 9600 baud or above, something else to check is that you are using a "hi-speed" (hardware handshaking) modem cable. The info below comes from a post by Tae Song (White Wolf). It matches the recommended cable described in the Spectrum manual: View is looking into the connector at the pins. Male Mini-Din 8 RS-232 Male DB-25 6 7 8 01 02 03 04 05 06 07 08 09 10 11 12 13 3 4 5 14 15 16 17 18 19 20 21 22 23 24 25 1 2 DIN-8 DB-25 Signal Discription 3 2 TD (Transmit Data) 5 3 RD (Receive Data) 4,8 7 GND (Ground) 2 5 CTS (Clear to Send) 1 4,20 RTS (Ready to Send) (20 = Data Term Rdy, DTR) 7 8 DCD (Data Carrier Dectect) Mainly, I use Spectrum; but, a ProTerm 3.1 setup should be very similar. For example, with the above stuff, you would want to turn ON Hardware Handshaking. Also, usually, Binary Up should be OFF and Binary Down should be ON. Rubywand