Re: [time-nuts] Trimble Acutime Gold PPS

2013-05-19 Thread Chris Albertson 
Without a full schematic diagram about the only thing I can ask is if
yuremembered that for RS232 the control and data signals are reversed.

For rs-232 Tx and Rx use a negative (low) for a logic one.  But DCD uses
the other convention with a positive meaning  one..   So if you can see the
serial data you have that correct.  try flipping the RS422 wire for the
control signal.


On Sun, May 19, 2013 at 2:03 PM, Miguel Barbosa Gonçalves m...@mbg.pt wrote:

 Hi!

 I am struggling trying to convert my Acutime's PPS signal from RS422 to
 RS232 for NTP use.

 I am using this converter: http://www.dpieshop.com/quatech
 -sscvt500n-rs232-to-rs422485-serial-converter-p-282.html and I connected

 - Port A (T+) to R+ on the converter
 - Port A (T-) to R- on the converter
 - PPS+ to T+ on the converter
 - PPS- to T- on the converter

 On the RS232 part of the converter

 - TXD (pin 3) to computer pin 1 (DCD)
 - RXD (pin 2)to computer pin 2 (RXD)
 - GND (pin 5)to computer pin 5 (GND)

 all other pins are connected to the same pin on the computer except for the
 DCD on the converter which is not connected.

 I can see the serial time code on the computer yet the PPS (a long 400 ms
 one) doesn't seem to reach the computer.

 I've tried everything I could remember off and connecting the RS422 PPS+
 pin directly to the computer makes the NTP daemon stop randomly and losing
 the PPS signal. I really think I need to convert the PPS signal (30 meters
 long cable). Without PPS and using this converter NTP works fine. The
 problem is the jitter I am getting.

 I think I've exhausted every option with this converter and found this
 converter: http://www.ko4bb.com/~bruce/GPS_RS232_RS422_Transceiver.html.

 I might try it. Anyone here tried it or has any input for this situation??

 I also think that from a time nut perspective building my converter instead
 of using a black box will enable me to see what is the delay in the signal
 conversion.

 Any help would be highly appreciated.

 Kind regards,
 Miguel
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-- 

Chris Albertson
Redondo Beach, California
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Re: [time-nuts] Trimble Acutime Gold PPS

2013-05-19 Thread Mike S 

On 5/19/2013 5:03 PM, Miguel Barbosa Gonçalves wrote:


- Port A (T+) to R+ on the converter
- Port A (T-) to R- on the converter
- PPS+ to T+ on the converter
- PPS- to T- on the converter

On the RS232 part of the converter

- TXD (pin 3) to computer pin 1 (DCD)
- RXD (pin 2)to computer pin 2 (RXD)
- GND (pin 5)to computer pin 5 (GND)



I can see the serial time code on the computer yet the PPS (a long 400 ms
one) doesn't seem to reach the computer.


You're trying to have two different signals sourced on the 422 side 
converted to 232 outputs. That converter is bidirectional, it converts 
one signal from 422 to 232, and another from 232 to 422. Your PPS signal 
is going into an output on the converter.

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Re: [time-nuts] Trimble Acutime Gold PPS

2013-05-19 Thread Miguel Barbosa Gonçalves 
No dia 19/05/2013, às 22:44, Mike S mi...@flatsurface.com escreveu:

 On 5/19/2013 5:03 PM, Miguel Barbosa Gonçalves wrote:

 - Port A (T+) to R+ on the converter
 - Port A (T-) to R- on the converter
 - PPS+ to T+ on the converter
 - PPS- to T- on the converter

 On the RS232 part of the converter

 - TXD (pin 3) to computer pin 1 (DCD)
 - RXD (pin 2)to computer pin 2 (RXD)
 - GND (pin 5)to computer pin 5 (GND)

 I can see the serial time code on the computer yet the PPS (a long 400 ms
 one) doesn't seem to reach the computer.

 You're trying to have two different signals sourced on the 422 side converted 
 to 232 outputs. That converter is bidirectional, it converts one signal from 
 422 to 232, and another from 232 to 422. Your PPS signal is going into an 
 output on the converter.

Hi!!

I suspected that this could be the case.

I think I'll build the converter whose schematic I posted previously.

I will be entertained for a few days for sure.

Thanks for your help!

Regards,
Miguel
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