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Multiport for TNPP and TAP Outdial

146 025-9035AA

TAP Outdial

TAP Outdial uses a Multiport serial card with an external modem to dial other paging

terminals to deliver pages using TAP (Telocater Alphanumeric Protocol).

When a caller enters a subscriber ID that is set up as TAP Outdial in the paging terminal,

the terminal takes the message, then turns around and dials out (on a regular end-to-end

phone line) to another paging service and delivers the message via TAP. For more on

general and operational details, refer to the “Outdial TAP Networking” section of 2000

Series Paging Terminals Operating and Programming Manual (Part No. 025-9034-001).

TAP outdial is separate from TNPP. A Multiport card can be used for one or the other, but

not both on the same card.

The modem used should be a Hayes-compatible external modem. This is the same type of

external modem that is typically used with personal computers. For most applications, a

1200 baud (212-type) modem (which does 300 baud as well) is sufficient.

Higher-speed modems generally are not needed or beneficial for this application, since

few systems support TAP input at higher rates. However, higher-speed modems can be

used as long as they can do the lower baud rates; but they tend to have more settings and

be more complicated to set up than a plain 1200 baud modem. Strictly speaking, the

modem does not have to be Hayes-compatible. Any modem that is Bell 103 and/or 212

compatible, and can originate calls, should work.

For the pinouts of the Multiport card, punchdown block, and cables, refer to the previous

section on the Multiport Serial Card in this manual.

It is a good idea to have the modem's DTR input line driven by the TAP Outdial

(Multiport) card. In other words, the output line labeled “RTS” on the diagrams should be

connected to the modem's DTR input (usually pin 20). Also, it is nice if the modem's

carrier detect (CD) output line drives the TAP card's CTS input line.

Outdial TAP is restricted to ID paging. This is a limitation of TAP itself. Refer to

Appendix A if you are interested in the details of the TAP protocol.

Modem Related Information

The signal line we normally call RTS (pin 4 on the DB25) should be connected to the DTR

pin (# 20) of the DB-25.

The reason to drive the DTR line is that the “Hayes escape sequence” of

<pause>+++<pause> may not always get a modem into command mode. Driving DTR

inactive has a better chance of getting a modem into command mode; however, as a side

effect, it often causes the modem to hang up the telephone line.

The modem being used should be configured to respond to DTR. On older modems, this is

usually set by a DIP switch. Newer modems use “AT” commands - the factory setting is

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ZETRON 2000 Series Spezifikationen Seite 146