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2635A
Users Manual
6-4
Connecting the Modem to a PC for Modem Configuration
The two most common configurations for connecting the modem to a PC are shown in
Figure 6-2. The modem RS-232 port (DB-25 connector) is cabled to a PC serial COM
port that uses either a DB-9 connector or DB-25 connector. The connecting cable can be
fabricated (See Appendix D) or ordered from Fluke as an option (see Chapter 1).
Configuring the Instrument Modem for Modem Operations
Commands to configure the modem are sent from the PC that is running
communications software. The example below uses the Terminal mode that is available
on any PC that is running Windows software. Modem operation at 2400 baud is assumed
for this procedure, which should be adapted, as required.
1. Start Windows and open TERMINAL on the ACCESSORIES menu.
2. Open the SETTINGS menu and select COMMUNICATIONS.
3. In COMMUNICATIONS, select the following, then use OK to exit to TERMINAL:
Connector COM 1 [Typical]
Baud Rate 2400
Data Bits 8
Stop Bits 1
ParityNone
Flow Control None
4. In TERMINAL, enter a few AT <ENTER> character sequences. If the cable
connection is correct and the modem has LED indicators, the data send and data
receive indicator will blink. If LED blinking is not observed, check the cabling and
verify that the correct PC COM port was selected in step 3.
5. Enter the command ATV1 <ENTER>, which gives result codes in English, instead
of numbers. For example, the AT <ENTER> characters entered in the last step
would display the result code OK.
6. Enter the command ATS0=1 <ENTER>, which configures the modem to answer
calls after one ring. [The 0 character of the S0 portion of the command is the number
zero.]Observe the result code OK.
7. This completes the software configuration of the modem. Check all modem DIP
switches for proper settings. In particular, some modems have a NO ANSWER
switch that must be disabled or the modem will not answer calls. Be sure the modem
remains powered or the configuration data could be lost. Refer to your modem
manual, as required.