[CQ-Contest] [SECC] CT-17 Problem
k8cc at comcast.net
Mon Sep 12 00:27:36 EDT 2005
At 10:44 AM 9/9/2005, Paul Hansen wrote:
>There is no special RS-232 cable required. Any serial cable should work.
The first sentence is correct. The second is not completely true.
The cable between a CT-17 and a PC-style serial port should be "straight
thru" - i.e., not a "null modem" cable which swaps the TXD (TX data) and
RXD (RX data) pins.
This is complicated by the fact that TXD/RXD are pins 2 and 3 on any PC
serial port. However, the actual pins on a DB-9 serial port are reversed
from a DB-25 serial port, which confuses things.
I would get a null modem adapter (either a 9 or 25 pin) and stick it in and
see if it helps. If it does, then you have the wrong kind of cable.
Also, on my CT-17 at least, only the #4 jack seems to work. It's been that
way since purchased new in 1989.
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