Chapter 7. Installing an Analog Modem7-4 Express 3000 User Manual 61203153L2-20the Express Configuration program (Tray Tool Menu) or by using aVT-100 terminal emulation package (such as HyperTerminal).If you are connecting an external analog modem that has not beenused by a PC running Windows 95/98, you must configure it beforeyou can use it (see Configuring the External Analog Modem on page 7-4).Configuring the External Analog ModemTo configure the external analog modem, set up the communicationssoftware so it uses the same serial COM port to which theExpress 3000 is connected.To install and use an external modem that does not support230.4 kbps, set DIP Switch 1 on the back panel of the Express 3000 toON (down), thus limiting the DTE speed to 115.2 kbps. To re-enable the230.4 kbps operation for ISDN connections, set DIP Switch 1 to theOFF (up) position.When using an external analog modem that does not support230.4 kbps with applications that support Express 3000 operation at230.4 kbps, attach the Express 3000 to the high-speed 16650 UARTCOM port and connect the external analog modem to a separate COMport. This setup allows the Express 3000 to operate at 230.4 kbps andthe external modem to operate at the reduced speed.Setting the Carrier Detect SignalBefore enabling the modem using the Express Configuration pro-gram, set the Carrier Detect (CD) signal from the modem to Normal(track CD signal). Use the AT command AT&C1 to do this. To enter ATcommands into the modem, open a VT-100 terminal emulation ses-sion and enter the following ( indicates you should press the En-ter key to insert a carriage return):
