Specifications

4.5

Using A Modem

To program the DXP remotely through a VDT or PC, you must use a

pair of data modems. These modems can be any commercially

available, Hayes-compatible modems with auto-answer capability.

You should verify that the modems have auto-answer capability

before purchasing them. If the modems do not have auto-answer

capability, someone at the site must manually activate the on-site

modem.

When you install a modem, always consult the modem manufacturer’s

manual and check the configuration of the signal leads. If the

modem’s cable is not equipped with an RS232 jack compatible with

the

DXP’s

serial data ports, you might have to rewire the cable with

the proper connector.

To connect the modem to the DXP, run the modem’s cable between

the modem’s data jack and one of the DXP serial port; then connect

the modem to the outside telephone network in one of two ways:

Reserve a line exclusively for remote programming by

punching down the appropriate leads on the type-66 line block

and running a line cable directly to the network jack on the

modem.

Install a line switch for the modem between the type-66 line

block and the common equipment; the line will be available

for system users unless the switch is thrown, at which time the

remote programmer will have exclusive use of the line. Keep

in mind that using this method requires someone at

the

installation to turn the switch before remote programming can

begin.

To begin remote programming after you have installed the modems,

establish the data link between the modems by dialing the appropriate

phone number. Then program the DXP exactly as if your VDT or PC

were connected directly to the system.

Programming The DXP 4