Digital Security Controls PC1575 Installation Manual download pdf (Page 105)

male end of the cable. If not all 25 pins are present, it does not necessarily mean

it will not work, but it does mean that the cable has either been modified, or was

not standard to begin with. In this case, trying a new modem cable might solve

your problems.

9 Check the Program Configuration Settings. In the Program Configuration function,

there are a number of settings that apply to your modem setup. First, make sure that

you have selected the correct COM port. If you are not sure which COM port you

are using, then try toggling the value. Second, check to see if you are using the right

dialling method; if you have pulse dialling, then selecting DTMF (touch tone) dialling

will not work. Third, although this won’t affect the operation of the modem, make

sure that you can hear the modem speaker; if the speaker is turned off or the volume

is too low, then you may only think it is not working, when it actually is. Fourth, some

modems do not have the capability to automatically change speeds, and must be

initialized every time you want to change the speed. If you suspect this might be the

case with your modem, then try setting the modem initialization speed to slow, so

that the modem will not have to drop down to the slower speed to communicate.

Last, select the correct kind of modem (Internal or External).

10 Check Your Modem Manual. Many modem manuals have sections in them

devoted to troubleshooting. These can be quite useful because they pertain to your

exact type of modem whereas the topics discussed above have been very general.

If you have general communication software which lets you talk directly with the

modem and enter Hayes AT commands, then there are specific troubleshooting

tests you can perform. Some examples of general communication software are

Telix

, Procomm

, Mirror

, Crosstalk

, and HyperTerminal

NOTE: Although many modems will work with the DLS-1 software, the only modem

fully supported by Digital Security Controls Ltd., is the modem available with the

software as an option (MD-12).

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Digital Security Controls PC1575 Installation Manual Page 105