[Ham-Mac] Need help configuring MacTNC

[Steve Hellyer]

Hi Lew,

Have not used one of these in quite a while. Here is the manual...
http://www.w1ngl.com/radios/pk-88/PK-88%20User%20Manual.pdf

I suspect TNC is not sending anything back because the RTS pin is not  
asserted.  AKA it's looking for Hardware Handshake not software (X-ON/ 
X-OFF) by default.
Need to wire that cable with addition of RTS/CTS.

Request to Send (RTS) and Clear to Send (CTS)
This provides the standard form of flow control for a DTE to DCE link.  
In this situation all the circuits in the interconnecting cable should  
be wired pin-for-pin, as shown below:-

-------------- next part --------------



Even if you checked RTS and DTR as the lines are connected so it would  
not make a difference.  That a DB-25 on the back of the PK-88 (DCE)  
and you have a DB-9 on the serial adaptor (DTE).

This should help.

http://www.lammertbies.nl/comm/cable/RS-232.html

73
Steve - VA3SPH


On 13-Apr-09, at 1:07 AM, Lew Phelps K6LMP wrote:

> Hey, I could use some advice from anyone out there who is running a
> PK-88 packet modem with MacTNC.
>
> I bought a used PK-88 on eBay recently.  It appears to be functioning
> normally, but I am unable to get it to run its basic baud-checking
> sequence.
>
> I am running MacTNC 1.2  The PK-88 is connected through a rewired 25-
> pin to 9-pin modem cable, with the following lines connected:
> TXD to TXD
> RXD to RXD
> GND to GND
>
> The serial modem cable is connected to a Keyspan 19USA serial-USB
> converter. The pin-outs used for the modified cable match up with the
> pins on the USA10.
>
> When I power up PK-88, I get the expected "Type a star (*) to
> begin...." message, but typing an asterisk followed by CMD-T
> ("transmit") produces no action with the TNC.
>
> MacTNC settings:  1200 baud, 7 bit, even parity, one stop. XON turned
> on.  RTS and DTR turned off (not checked).
>
> If anyone is using this combination of hardware and software, any
> advice would be appreciated.
>
> Also, are there any other applications I should be considering, other
> than MacTNC, to control the PK-88?
>
> Thanks,
>
> Lew K6LMP
>
>
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