[Packet] Re: MFJ-1270B Help

[W0OXJ]

Thanks to all that replied.One suggestion was to ring out the rs-232
cable.As I was told the cable had been used with this TNC I discounted
checking it.Well, the cable is a non-standard rs-232 config and the tx data
was crossed with the sig ground.I just ordered the correct cable.I know
better than to assume anything but oh well!!

Again,many thanks and 73.
----- Original Message ----- 
From: "W0OXJ" <rfjones at ris.net>
To: <packet at mailman.qth.net>
Sent: Tuesday, November 22, 2005 11:19 AM
Subject: MFJ-1270B Help


> New to packet and just bought this TNC.It just came out of service.For the
> life of me I cannot get my PC to talk to this device.It sends and receives
> at all baud rates but the characters are jumbled and the CR/LF is
> intermittant based on config.
>
> .I have changed everything in the PC,comm port,terminal program,drivers
and
> tried every comm port parameter available.I tried the comm setup on Winpac
> 6.80 and Hyperterm but am using Bitcom until I establish communications.I
> have verified all TNC straps and replaced the button cell.The RS-232 cable
> has pins 2-8 and 20,22 wired on the TNC end and a db-9 plugs into the PC.I
> assume this is not a null modem as I can receive characters and the enter
> key will move the cursor.I have 12vdc applied from a MFJ 500ma wall wart.
>
> I understand there are TNC commands to effect the communications but
> obviously I can't access the TNC for command entry.
>
> I have worked on lots of rs-232 over the years but this one has me
stumped.
>
> Any help and guidance would certainly be appreciated.
>
> 73,
> Bob
> W0OXJ
>