Instruction manual

Communications Setup

025-9416 37

IBM-Compatible

Office Computer

PSTN

To Telephone

Trunk Cards

Model 640

To Internal

or external

modem

RJ-11

phone

line

Figure 13. Modem Connection to the Model 640

To setup the system for modem connection, follow the steps below:

1. Determine which trunk of the Model 640 to use for modem maintenance.

2. Connect the office PC modem to a standard telco line using RJ-11 cable. If the PC

modem is external, connect the modem to the computer’s serial COM port using RS-

232 cable (usually standard 25-pin male connectors on both ends).

Note: Make sure to use the modem jacks labeled “LINE” or “TELCO” if an external PC

modem is installed. Do not connect to the “PHONE” or “LOCAL” jacks, as they are

for telephone sets only.

3. Connect the desired Model 640 trunk to an end-to-end, loop start telco line. Use the

50-pin trunk and radio station interface for connections.

ESTABLISHING ZLINK COMMUNICATIONS

A communications link must be established once the physical connections have been completed

between the Model 640 and the office computer, console, or dumb terminal. Follow one of the

procedures below to initiate a ZLINK connection.

Note: This subsection gives only an overview of how to setup MCU for test purposes. Refer

to the Model 640 Operating and Programming Manual (Part No. 025-9417) for

details on the software operation of the paging terminal.

ZLINK Connection Through MCU

This procedure describes how to establish communications with the Model 640 using MCU.

Recall that MCU can only be run on an IBM-compatible office computer. If the ZLINK connec-

tion is made with a dumb terminal only, skip this subsection.

Follow the steps below to configure MCU for ZLINK communications.