level shifter (pin 5), I was able to
communicate with the device.
Thanks,
James
Date: Sun, 09 Dec 2012 23:25:25 -0800
From: Hal Murray hmur...@megapathdsl.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A OSMT connector
The trip point is specd to be between -3 to +3, which is why 5V works,
especially since the trip point is usually positive. I would set it
around 1.5V. The transmitters are required to swing +/- 5V.
I'm not sure the 232 allowed lower voltage as much as all we had to
work with were charge
Hi
You may have a TTL output level version of the FE.
Bob
On Dec 10, 2012, at 1:24 AM, James Peroulas ja...@peroulas.com wrote:
For the record, my device did have an OSMT (not Hirose) connector on the
DDS board.
I'm having trouble getting the internal RS232 port on the DDS board to work
ja...@peroulas.com said:
I'm not able to get it to respond to the 'S' command and when I measure the
voltage on the RS232 TX pin (#2 from the left) it's always 0v. Shouldn't it
be -12v when idle?
Newer RS-232 allows 6V rather than 12.
In practice, it's not all that uncommon for designers to
EIA-232 trip points are positive so that you can cheat and drive them
with logic, so it is not unusual to find 232 that doesn't go negative.
This is OK for short distances. This should not be called 232, but often
they state 232 compatible. You can take a logic gate and make it
handle +/-15V
