[time-nuts] time-nuts Digest, Vol 105, Issue 11

[Mark C. Stephens]

Thank you Chuck, That certainly hit the spot.


I can certainly verify the Z3805A is unresponsive to commands on Port 2.

May I ask where the port2 Broadcast (Continuous Output) Mode is documented?


mark

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See below:

Broadcast (Continuous Output) Mode:
The Serial Port (Port 2) interface is used by the GPS Receiverto broadcast the time of day and abbreviated status once every two seconds on the even second. 
The length of the transmission is 16 bytes and is partially decoded below (The data is shown in Hex):
00 09 01 07 03 01 04 04 00 02 03 01 03 00 00 0D 
All numerical data is transmitted as a single byte per digit, i.e. digit 9 is transmitted as 09 Hex.
Bytes 1-2 are two least significant digits of the Year (00 09) 2009.
Bytes 3-5 are the numerical Day of the Year (01 07 03) or day 173 (June 22).
Bytes 6-7 are the Hour (01 04), hour 14 or 2 PM.
Bytes 8-9 are the Minute (04 00), minute 40.
Bytes 10-11 are the Second (02 03), second 23.
Bytes 12-13 are the Accumulated Leap Seconds (01 03), 13 leap seconds.
Bytes 14-15 SmartClock Mode or Status:
01 00: Power-Up Mode
10 00 Holdover Mode
00 00 GPS Lock Mode
Byte 16 is a Carriage Return (0D).
Under the example above, the Date and Time is June 22, 2009 (day 173) at 14:40:23, and no Holdover.
On the Port 2 serial interface, the serial port parameters are fixed at 9600, N, 8, 1 and cannot be changed. 
Although the Port 2connector is wired for Receive Data (pin 3) it does not appear that the GPS Receiverwill accept any commands. 
All commands must be issued over the Port 1serial interface connector.

Chuck Zabilski
BD Systems, Inc.