Basic Modem Programming
Dust off your modem manual and have it handy. Use tip to connect to the modem and program the modem registers. Be sure to write out the modem's registers to NonVolatile RAM when you're done. Program the modem with the following settings.
Hardware DTR, Normal DTR, or Reset When DTR Toggles.
When the Sun system drops DTR, the modem should hang up the phone line and reset the modem to NonVolatile RAM settings.
Hardware Carrier Detect or Normal Carrier Detect.
The modem should raise Carrier Detect (known as CD or DCD) only when there is an active carrier signal on the phone connection. You'll set up the port monitor so that when CD goes active, the Sun system spawns a login.
When carrier drops, either when the other end of the ...
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