Modem Thread

Terry

Terry

Line Up and Wait
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Terry
Hi All:

Can anyone explain in detail about this modem string?

AT&FE0S0=1&C1&D2&B1&W

I just installed a modem for a refrigeration rack controller and had to enter this string from the controller to the modem. What am I literally doing?

I know about "handshaking" but was curious about each character in the string.

Thanks;

Terry :dunno:
 
Terry said:
Hi All:

Can anyone explain in detail about this modem string?

AT&FE0S0=1&C1&D2&B1&W

I just installed a modem for a refrigeration rack controller and had to enter this string from the controller to the modem. What am I literally doing?

I know about "handshaking" but was curious about each character in the string.

Thanks;

Terry :dunno:
Click to expand...
I do speak AT. A lot of that is manufacturer specific.

What do I remember?

&F = Reset to Factory settings (Thanks, RJM)
E0 = Don't Echo characters

S0=1 = answer on one ring
&C1 and &D1 = Carrier detect and DSR (RS232 signal lines) I think 1 means make it true state. i.e, set CD when the modem is connected, Expect DSR when I want to modem to turn on.
&B1 = Maker specific but is a fixed rate for the serial port. Prolly 9600 or 19200.
&W = Write those settings to NVRAM. It's not necessary to that every time. That's why it's non-volatile.

I worked a year doing what Nick does for U.S. Robotics.

I've also been using personal computers longer than IBM so I used to issue the commands myself.
ATE1M3
ATDT5551212
 
Last edited:
I think...

AT: Pay Attention
&F: Load Defaults
EO: Disable Auto-Retain
SO=1: Set register to 0, answer after one ring
&C1: Turn the DCD signal on when carrier signal is detected
&D2: Monitor DTR signal, and if DTR is lost, respond to AT commands
&B1: Use fixed serial port transfer rate
&W: Write Configuration to Profile

Could be wrong, though...

__________________
Rich
Vaguely remembers dialup modems
 
Oops... I would take Mike's word over mine. It's been quite some time...


-Rich
 
mikea said:
I do speak AT. A lot of that is manufacturer specific.

What do I remember?

&F = Reset to Factory settings (Thanks, RJM)
E0 = Don't Echo characters

S0=1 = answer on one ring
&C1 and &D1 = Carrier detect and DSR (RS232 signal lines) I think 1 means make it true state. i.e, set CD when the modem is connected, Expect DSR when I want to modem to turn on.
&B1 = Maker specific but is a fixed rate for the serial port. Prolly 9600 or 19200.
&W = Write those settings to NVRAM. It's not necessary to that every time. That's why it's non-volatile.

I worked a year doing what Nick does for U.S. Robotics.

I've also been using personal computers longer than IBM so I used to issue the commands myself.
ATE1M3
ATDT5551212
Click to expand...

Ahh, I miss the days of modem strings:

ATDT5551212 was more fun to issue as ATDP5551212 if you were just having fun.

ATA on the other end, waiting for the call to come in.

AT&F? - replace the ? with a factory default setting. I suspect in this case, AT&FE0 is actually a factory default setting of E0 (although, ATE0 does make the modem not echo commands...so as its been a LOOOOONG time, I could be wrong).
ATSO=1 is the setting for the ring indeed, but setting to ATSO=0 leaves the modem at default, which is usually 1 anyways.
The rest, Mike's got 100% correct without any dispute on my part :D
 
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