foxworth@bnlux0.bnl.gov (robert l. foxworth) (08/23/90)
As a new comer to modem use I need to ask something that may be obvious to many on this group. When using either a Smart One 2400X or a CTS Datacomm 2424ADH (both of which appear to be substantially if not fully Hayes-compatible) I will finish an on-line connection, and attempt to go to command mode so I can send the ATH. To do so, I wait then send the three + signs but don't get the OK response. I am on a PC running PcPlot which is a VT-100 terminal emulator. I would like to know if there is a register setting or other thing I am overlooking. I thought that *any* string of 3 plusses, with the guard time, while connected, would send an OK back. I checked the S2 register with a terminal on the 232 port and it returns 043. Any help? The modem in this case is being used in dialing outward.
tnixon@hsfmsh.UUCP (Toby Nixon) (08/24/90)
- ... I will finish an on-line connection, and attempt to go to
- command mode so I can send the ATH. To do so, I wait then send the
- three + signs but don't get the OK response. I am on a PC running
- PcPlot which is a VT-100 terminal emulator. I would like to know if
- there is a register setting or other thing I am overlooking. I
- thought that *any* string of 3 plusses, with the guard time, while
- connected, would send an OK back. I checked the S2 register with a
- terminal on the 232 port and it returns 043.
In addition to register S2 (which contains the escape character; 043
is decimal for the ASCII "+" character), you also have to consider
the guard time specified in register S12. S12 is specified in 20
millisecond increments, with the default being 050 meaning 1 second.
For the "+++" escape sequence to be recognized, there must be NO
characters received before the first "+" for at least the time
period specified in S12, and no characters after the third "+" for
that time. ALSO, the time BETWEEN the "+" characters must be LESS
than specified in S12. So, even though you pause before the first
"+", you must be sure to send the three "+" characters close enough
together that S12 doesn't expire in between.
If that doesn't turn out to be your problem, let me know and I'll
try to think of other solutions.
-- Toby
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