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ZL3AI > TECH 28.02.04 10:07l 83 Lines 2958 Bytes #999 (0) @ WW
BID : ZL3AI1328
Read: DB0FHN GUEST OE7FMI
Subj: Re: Printer port to Serial ?
Path: DB0FHN<DB0RGB<DB0MRW<OK0PKL<OK0PPL<OK0NAG<OK0PCC<OM0PBC<HA5OB<HA3PG<
JE7YGF<JK1ZRW<WB0TAX<ZL2TZE<ZL3VML
Sent: 040228/0703Z @:ZL3VML.#80.NZL.OC #:19997 [Chch-NZ] FBB7.00i $:ZL3AI1328
From: ZL3AI@ZL3VML.#80.NZL.OC
To : TECH@WW
Hi Rickie,
>From: N2RIK@KB2VLX.#BRONX.NY.USA.NA
>To : TECH@WW
>
>Is it possible to convert the print port
>on the computer to a serial port ? I have
>a old laptop computer that I would like to
>use for packet but it doesn't have a serial,
>only a printer port. Is it possible ?
>
>Rickie / N2RIK
Not that I am aware of :-(
But all is not lost :-)
The TFPCX driver can use a printer port to connect to a BayCom modem, even
though it usually uses a serial port for that purpose.
Here is the relevant paragraph from the docs:
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
3.1. Serial Modems
BayCom-compatible modems can be used without changes. In rare cases
there could be problems which are caused by the more stable supply of
power to the modem in TFPCX compared BayCom. In TFPCX the TXD line
remains steady at approximately +12V, the BayCom solution has a pulse
signal on this control line. Therefore the supplied voltage to the
modem is a little higher, the voltage on pin 7 of the TCM3105 may not
have the ideal voltage anymore. In this case a re-adjustment of the
voltage on pin 7 is required (see modem documentation). Tip: this
voltage is also very important for the correct functioning of the
software DCD, you can use the Soft DCD indicator to adjust the
voltage.
Additionally there is a option of connecting the modem (e.g. from
DigiCom) to a LPT-Port. When using this, 6 data output lines are
switched to a stable 5V which could be used as voltage supply to the
modem (Use at your own risk)
Here are the connections for the Modem-Ports
COM-Port
Signal 25pol. 9pol. Meaning
DTR 20 4 Transmit data +/- 12V
RTS 4 7 PTT, High active, -12V=RX, +12V=TX
CTS 5 8 Receive data
GND 7 5 Signal ground
TXD 2 3 +12V for BayCom-Modem
LPT-Port
Signal 25pol. Meaning
DATA1-6 2-7 constant 5V approx. for Modem
DATA7 8 Transmit data, TTL-Level
DATA8 9 PTT, High active, 0V=RX, 5V=TX
BUSY 11 Receive data
GND 18-25 Signal ground
Modems using the AM7911 can also be used. You may have to increase
the TXTAIL-parameter (command @TA) a little for this. At this point I
like to point out you need different modems for higher baudrates.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
The latest version of TFPCX is 2.73 and should be used in preference to older
versions as it has a number of important bug fixes.
With the ability to use the TFPCX driver, you should now be able to use TPK,
T4, FBB, TSTHOST or a large number of other programmes on your laptop.
73, David.
T4 1.5à24
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