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Modem Communications
This section gives details on communicating with the instrument from
a remote
PC using a modem. To communicate over the phone lines,
you must have a
PC and two modems. One modem is connected to your PC
(local modem) and the other is connected to the 34970A (remote modem).
The steps below show how to set up a typical modem.
1. Connect the remote modem to your local
PC.
2. Run the Windows Terminal or Hyper Terminal program to configure
the modem. These programs can be found in the Accessories group.
3. Set the baud rate using the Terminal program to the same value used
for the 34970A. For more information on setting the instrument’s
baud rate, refer to “Baud Rate Selection” on page 152.
4. Configure the remote modem for auto answer, disable command echo,
and disable result codes. Save these settings as the active profile.
For example, when using a U.S. Robotics
®
56K modem, the command
string is “AT&F1S0=1E0Q1&W0”, where:
AT Set the baud rate and configure the modem to expect more commands.
&F1 Place the modem in its factory configuration, which is compatible
with most PCs.
S0=1 Set to auto answer after one ring.
E0 Disable command echo mode.
Q1 Disable result codes.
&W0 Store settings for power-on profile.
5. Configure the 34970A for the “Modem” flow control mode
(for more information, see “Flow Control Selection” on page 153).
6. Remove the remote modem from the PC. Connect the remote modem to
the 34970A using the RS-232 cable supplied (if you ordered the
internal DMM) and modem adapter. The modem adapter is available
in the 34399A Adapter kit.
7. After turning on the remote modem, you should notice that the AA
(auto answer) light is on. When you turn on the 34970A, you should
notice that the TR (instrument ready) light is on.
8. Connect the remote modem to the phone line. From the local modem,
dial up the remote modem using BenchLink Data Logger or another
software application.
Chapter 5 Remote Interface Reference
Modem Communications
274