hhs@hou2h.UUCP (H.SHARP) (07/31/85)
I have been trying out a Hayes 2400 modem working with a Teletype 5420 terminal. I have noticed that the Hayes modem does not raise Data Set Ready until it gets answer tone from the remote modem. The Teletype terminal will not receive data from the modem unless Data Set Ready is raised. This means that I can call out using the keyboard, but I get no echo from the modem and I get no call progress messages from the modem. Once the connection is made, everything works normally. I have not found anything in the Hayes manual for setting the modem so that Data Set Ready follows Data Terminal Ready or any other solution. I am strapping Data Set Ready high on the terminal side. This problem doesn't occur on the HP 2621 terminal. What would happen if a terminal needed Data Set Ready for transmission? Another problem I have noticed is using the Hayes to call into our computer. The computer is using AT&T modems. About three out of four times I call in, after I get the "Connect 1200" message (no 2400 bps modems on the other end) I get a line of garbage on the screen. The computer times out and disconnects the call. Anyone else notice this problem?
gws@cbnap.UUCP (Gary W. Sanders (N8EMR)) (08/01/85)
In article <991@hou2h.UUCP> hhs@hou2h.UUCP (H.SHARP) writes: >I have been trying out a Hayes 2400 modem working with a >Teletype 5420 terminal. >I have noticed that the Hayes modem does not raise Data Set Ready >until it gets answer tone from the remote modem. The Teletype >terminal will not receive data from the modem unless Data Set Ready >is raised. > ...... > ...... > ...... > ...... Try shorting pins 5 to 6 or pins 5 to 8 on the 5420, The 5420 will work (as you have noted) , but not full function. >Another problem I have noticed is using the Hayes to call into >our computer. The computer is using AT&T modems. About three >out of four times I call in, after I get the "Connect 1200" >message (no 2400 bps modems on the other end) I get a line of >garbage on the screen. The computer times out and disconnects the >call. Anyone else notice this problem? What speed is your terminal running? I have a USR2400 modem. If I have my terminal set to 2400baud and I connect to a 1200 baud modem, I get the "Connect 1200" message at 2400 baud but then the modem switches to 1200 baud and the terminal must be switched manualy to 1200 in order to converse with the computer.. tnx Gary W. Sanders (N8EMR) ihnp4!cbnap!gws AT&T Bell Labs (Columbus,Oh) -- test of sig file
earlw@pesnta.UUCP (Earl Wallace) (08/01/85)
I have Hayes 2400 modems and at times I get screenfulls of 'w's until I hit the break or, more often than not, power it down. The Hayes 2400 does seem to have a lot a problems. When dialing into the Hayes 2400 from another hayes 2400, I sometimes get 'CONNECT 1200' instead of 2400 and other times I hear the modem screaming and yelling but get only junk characters on my terminal. The connect failure rate on this modem seems too high for a modem that costs so much. I need at least 2 calls to another 2400 site before I get a good connection. Anyone else experienced these problems with 2400 baud modems? -earlw