drew@cup.portal.com (Andrew E Wade) (10/08/90)
Can anyone tell me if it's possible to get a cable from mac serial port to modem that supports hardware handshaking? If so, where? Local stores I've asked don't understand my question. My intent is to use it with my telebit t2500 modem. Currently, with software flow control, and connecting to "dumb" modem on other end, and if errors occur and resend requested, it gets way ahead of itself and very very very slow. So I have to set it to no flow control (s66=0) and manually set telecom program to whatever baud rate, then set it back, etc. -- which is a pain. White Knight manual claims it will support hardware handshaking, but the checkbox in cmd-U dialog is greyed out -- presumably, because my cable is not wired to support it. (?) Manual does say you need a special cable. Also, I use dial-in to shiva netserial with same model telebit t2500 modem. I wonder if that will work with hardware handshaking? Can I mix sw/hw? Telebit manual seems to say yes: s58/68 can be set to use "both". If you can clear this up for me, I'd sure appreciate it! :) -Drew Wade drew@objy.com
russotto@eng.umd.edu (Matthew T. Russotto) (10/09/90)
In article <34644@cup.portal.com> drew@cup.portal.com (Andrew E Wade) writes: >Can anyone tell me if it's possible to get a cable from mac serial port >to modem that supports hardware handshaking? If so, where? Local stores >I've asked don't understand my question. Yes, and believe it or not, from Hayes-- I think it's called a Mac-to-V-series Hardware Handshake cable. (Hayes puts their name on it, anyway). You can't use both DTR and hardware handshake. You can use carrier detect and hardware handshake, but you need to make your own cable and write your own program. If you like hardware hacking, you can convert a standard cable to hardware handshaking with a DB25-female connector, a DB25 male ribbon connector, and some ribbon cable. (this is the no-soldering solution, and can be done with no tools...) Connect the DB25-F in the standard way. Now, find out what pin handshake out is coming from. It is usually Pin 20 (DTR). Shift the wire that would connect to pin 20 on the DB25M so it connects to pin 4 (RTS)-- you do have to pull the ribbon cable apart. Now find out what pin handshake in goes into. It is usually 5,6,8, or (I've seen it once) 19. Pull this wire out, and shift it over to pin 5. (if it was pin 5 already, be happy). -- Matthew T. Russotto russotto@eng.umd.edu russotto@wam.umd.edu .sig under construction, like the rest of this campus.