ZETRON 2000 Series Specifications download pdf (Page 190)

Troubleshooting and Repair Procedures

190 025-9035AA

Figure 48: External Modem Cable

(The Shield on pin 1 is optional; if used, it should be connected only on one end of the

cable, to prevent ground loops; however, it usually does not cause problems if both ends

are connected).

If any of these lines are missing, ZlinkW probably will not work.

Zetron supports the Hayes Smartmodem 1200 and compatible modems. Zetron does not

support using modems that conform to the “WinModem” standard. These modems use

internal software to accomplish tasks that used be done by hardware units called UARTs.

This can create memory address problems that ZbaseW cannot deal with. The simplest

solution is to use a modem model that still has UARTs.

Modem Setup - Software

Unlike early modems, currently produced modems (that is, 2400 baud and faster) are

configured by software commands instead of switches or jumpers.

We provide a way to send a list of commands to the modem each time you start up the

ZlinkW software. ZlinkW checks to see if a file named

modem.ini exists, and if it does, it

sends the commands in it to the modem before starting up.

If you know what you are doing, it may be possible reconfigure these types of modems so

they permanently keep the configuration information. Each modem manufacturer does

this differently, so we leave this method up to you. If you have configured the modem so

that its configuration parameters are not volatile, the

modem.ini file is not necessary. In

many cases, it is actually easier to configure the

modem.ini file.

One question in the installation process asks whether you have a 2400 baud modem and

want it initialized each time you call. If you say yes, it makes a

modem.ini file which

contains commands that work for most 2400 baud modems. This command string is

currently:

AT&C1&D3X0/V1Q0/E1

DB-25S DB-9S Signal

1 — Shld

2 3 TXD

3 2 RXD

4 7 RTS

5 8 CTS

6 6 DSR

7 5 GND

8 1 CD

20 4 DTR

DB-25S

PC Female Connector

Modem

Male Connector

N.C.

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ZETRON 2000 Series Specifications Page 190

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