kevin@voder.UUCP (The Last Bugfighter) (07/21/87)
I recently bought an Avatek 1200hc modem for my 800 and am having some
problems getting it to work. If anyone has any experience with this modem
and can give me some advice I'd appreciate it.
Below are the pinouts of both the modem and the Atari 850 interface plus
the way I connected the two together and the modem's option switches.
Avatek 1200hc Modem pinout Atari 850 Serial Port #1 pinout
My
Pin I/O Function Hookup Pin I/O Function
2 In Transmitted Data (TD) <--- 3 Out Send Data
3 Out Recieved Data (RD) ---> 4 In Recieve Data
5 Out Clear To Send (CTS) ---> 8 In Clear To Send (CTS)
6 Out Data Set Ready (DSR) ---> 6 In Data Set Ready (DSR)
7 Signal Ground <--> 5 Signal Ground
8 Out Carrier Detect (CD) ---> 2 In Carrier Detect (CRX)
20 In Data Terminal Ready (DTS) <--- 1 Out Data Terminal Ready (DTR)
22 Out Ring Indicator (RI) 7 Out Request To Send (RTS)
Pin 22 on the modem and pin 7 on the 850 are not connected to anything.
Note that the modem has 2 inputs and 5 outputs while the 850 has 4 inputs
and 3 outputs (not including ground).
Modem Option Switch Settings (* indicates factory setting)
Switch Function UP DOWN
1 Data Terminal Ready DTR line signal *DTR forced on
2 Message Format *Displayed in words Displayed in numbers
3 Message display Messages not displayed *Messages displayed
4 Echo *Commands displayed Commands not displayed
5 Auto Answer Forced on *Disabled
6 Carrier Detect (CD) CD line signal *CD forced on
7 Clear To Send (CTS) CTS line signal *CTS forced on
8 Command recognition Commands not recognized *Commands recognized
I've played with the switch settings to no effect and have left them in the
factory default position.
I have 2 different modem programs for the 850 interface that run at 1200
baud and are Hayes compatible. In both case the programs will print that
they're dialing the phone number but nothing happens, there are no touch tones
dialed. The phone system does work normally for voice.
Any helpful advice will quarentee you a place in heaven. Well.. maybe
not quarentee, but I'll put in a good word for you. If I'm up that way.
--
Kevin Thompson {ucbvax,pyramid,nsc}!voder!kevin
"It's a sort of threat, you see. I've never been very good at them
myself but I'm told they can be very effective."