Campbell SAT ARGOS Manual do Utilizador Página 93

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ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 85
*WARNING: If you wish the ZENO
®
-3200 to dial out, DIP switch #3 must
be Down, rather than Up as shown here.
The ZENO
®
-3200 monitors CTS; however, it does not set RTS. The cable forces RTS to follow CTS at
all times. The ZENO
®
-3200 monitors the DCD line, and does not transmit any characters, or respond to
any commands unless DCD is asserted. This hardware handshaking will be handled correctly if you use
the correct cables as provided by Coastal.
Baud Rate at 9600
There are actually three different baud rates (communication speeds) to be considered when a ZENO
®
-
3200 communicates with a PC or other computer over a modem link.
Figure 6-3. Connecting a PC to a ZENO
®
-3200 via telephone modems.
You could have different baud rates for the three links: Computer to Modem A; Modem A to Modem B,
over the telephone network; and Modem B to the ZENO
®
-3200.
Normally, you do not have to worry about baud rates when connecting a modem to your computer, for the
following reasons:
When your computer sends a command to Modem A, the modem automatically determines the baud rate,
and sets its rate to match your computer’s rate.
When Modem A connects with Modem B, the two modems negotiate to decide the fastest baud rate they
are both capable of using, and which will give reliable communications over the phone line that is
available.
The remote modem is typically set up by an experienced operator.
When you send a command from your computer to the ZENO
®
-3200 by way of two modems, Modem B
at the ZENO
®
-3200 end sends the command to the ZENO
®
-3200 at the baud rate defined for Modem B.
The ZENO
®
-3200 has no way of knowing what this baud rate is. Unless it matches the ZENO
®
-3200’s
baud rate, the ZENO
®
-3200 will simply see a stream of rubbish––and it will not respond. To avoid this,
you must set Modem B and the ZENO
®
-3200 to have the same baud rate. We recommend 9600 baud in
most situations. This will be set when you configure your modem with the computer set to 9600 baud. If
the telephone line is very noisy, you may wish to try a lower baud rate.
Computer Modem A Modem B
ZENO 3200
PSTN/PBX
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