The "inverter's" went by the jargon name of "null modem" back in the day
...if you google "null modem" you will find the wiring diagrmas for
rolling your own with a couple DB9 connectors.... I have to use the null
modem adapter when using a standard off the shelf serial cable with my
z3801A as well
Dave
On 3/4/2016 2:26 PM, Philip Zahariev via time-nuts wrote:
As already tell you I have success with inverters and now can monitor state of
PRS 10. Attached send current status for comments. Any help appreciated.
Best regardsPhilip
From: Hal Murray <[email protected]>
To: Philip Zahariev <[email protected]>; Discussion of precise time and
frequency measurement <[email protected]>
Cc: [email protected]
Sent: Friday, 4 March 2016, 11:43
Subject: Re: [time-nuts] PRS 10 and serial port communication
As I already write PRS10 is configured as serial communication. With
oscilloscope I can see serial signals, but when enter this signal in
computer with TTL level USB2serial converter all information is repeatable
character unknown for me and not as described in manual.
You may need to add or remove an inverter in there.
Most serial ports on microprocessors and USB to serial chips are expecting a
TTL to RS232 level shifter and the standard level shifter chips all have an
inverter. If there are 0 or 2 inverters it should work.
Some GPS modules don't have any level shifter. Some devices include an
inverter but not the level shifter. That doesn't meet specs but it generally
works if you connected it to a real serial port (with level shifter).
I would connect a scope to the output side of the USB to serial chip and send
it occasional characters and use that as a reference for what a character is
supposed to look like.
Then look to the input side and see if it looks similar. In particular,
verify that the idle level is the same. Then check the baud rate and parity.
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Dave
[email protected]
www.ArtekManuals.com
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