[time-nuts] FE5680A

[Mike McCauley]

Hi,

On Monday, March 05, 2012 10:18:58 PM Sam Reaves wrote:
> Hello Group,
> 
> I just bought four of the FE5680A's that have the standard configuration
> Pin 1+15, Pin 2 Gnd, Pin 3 Lock, Pin 4 +5V Pin 5 Gnd, Pin 6 1pps?, Pin 7
> 10MHz, Pin 8 TX, Pin 9 RX.
> 
> I have a LED with a 330 ohm current limiting resistor on pin 3 (the
> 74ACT240 can sink up to 24mA and I am well below that) for the lock
> indicator. All of my units lock and produce 10MHz although the 1pps never
> switches.
> 
> I can not get any of the units to communicate using the DB-9 connections. I
> scoped the receive data into the unit all the way to the microcontroller.
> The RS232 and TTL levels for the data look perfect as well as the timing
> for 9600-N-8-1. However the unit never transmits any data.I scoped this all
> the way to the micro as well. Not a pulse spike or anything.

Were you trying to communicate with the ASCII commands like
S<cr>

and

F = XXXXXXXX (cr)

or were you using the binary commands documented in 
http://www.wa6vhs.com/Test%20equipment/FREQUENCY%20STANDARDS/FE-5680A/5680%20TECH%20MANUAL.pdf


Seems to me that the units currently available on eBay only support the binary 
commands.

Cheers.

> 
> Has anyone determined what the second serial interface is for? It seems to
> me that it would not make any sense for FE to install the RS232 port if it
> could not be used.
> 
> Any hints?
> 
> Thanks
> Sam
> W3OHM
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-- 
Mike McCauley                               mikem at open.com.au
Open System Consultants Pty. Ltd
9 Bulbul Place Currumbin Waters QLD 4223 Australia   http://www.open.com.au
Phone +61 7 5598-7474                       Fax   +61 7 5598-7070

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