Ramsey Electronics FZ-146 Bedienerhandbuch PDF herunterladen (Seite 19)

P-IBM • 19

The lines marked * are those actually used by the packet modem.

Consult the appendices of your computer manual for more detailed

RS232C information.

NOTE: We cannot over emphasize the importance of verifying that cables

and adapters are wired correctly with no shorts, open lines or wire

reversals. This applies to the off-the-shelf items for which you paid good

money as well as when making your own cables.

"PMP" PARALLEL PRINTER PORT ADAPTION:

t is possible to design a packet terminal program that makes use of the

parallel printer port of IBM-compatible computers. "PMP" (Poor Man's

Packet) is the example immediately familiar to us. The following information

pertains only to preparing the P-IBM modem to work in such a

configuration. Please consult "PMP" documentation for ALL other details.

In this application, a connection from the computer serial port to the modem

is still used, but only as a DC voltage source. In addition, however, you

need to build a special cable to connect the computer's parallel printer port

to the 5 points of the modem circuit clearly designated on the PC board

drawing (P2,P3,P11,P15 and P18).

[ ] Remove or don't install jumpers JMP1 and JMP2.

[ ] The cable goes together "by the numbers":

DB25 Printer Port P-IBM Modem PC-Board

2 P2

3 P3

11 P11

15 P15

18 P18

Use a male (ie: with pins) DB25 connector if you wish to plug it directly into

your computer's printer port. If you want to run your cable to a switch box or

the printer end of a parallel cable, choose your connector(s) carefully and

identify all pin numbers correctly.

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Ramsey Electronics FZ-146 Bedienerhandbuch Seite 19