EPSILON CLOCK MODEL EC1S
Spectracom Corporation
EPSILON CLOCK User’s Manual
5-2
•
The contents of sections <ID> and <CNT> are identical to those sent by the user
•
The content of the <DATA > section:
o
Is identical to that sent by the user if the message was a Command
o
Contains the information supplied by the clock, if the message was a Query
The acknowledgement to a Command is an exact copy of the message sent.
The reply to a Query is the copy of the Query message with the <DATA> section completed by
the EPSILON CLOCK®.
In a query, the <DATA> field is not taken into account by the EPSILON
CLOCK® command interpreter.
An Error message is generated by the clock if one of the following errors occurs:
•
The message contains an unknown ID
•
The number of bytes in the <DATA> section does not correspond to the <CNT> value
•
An overflow is detected in a parameter within the <DATA> section
NOTE:
If the clock detects a checksum error, it does not take into account the message
and it does not transmit any error message.
5.3
5.3
5.3
5.3
Commands description
Commands description
Commands description
Commands description
5.3.1 TOD output setup
This command allows the user to modify the contents of the periodical messages transmitted by
the clock on the TOD output. In standard mode, the default message transmitted contains the
current date and hour according to the codes provided herein. In diagnostic mode, the message
transmitted contains information regarding the disciplining of the frequency driver to the GPS
reference. This mode is used by the manufacturer during the “good” working verification phases.
5.3.2 TOD output transmission period
This command defines the transmission period to the TOD message on the corresponding
special link. This period is quantified in seconds; the value 0 inhibits permanently the
transmission of the message.
5.3.3 Clock reset
This command generates the re-initialization of the clock.
5.3.4 GPS mode setup
This command defines the clock functioning mode with regards to the GPS signals received.
Three modes are available: Automatic, Manual, or Mobile.
The Automatic mode is the default mode during the clock initialization. In this mode, the clock
averages during 1 hour the antenna position supplied by the receiver in order to make it reliable.
After this period and providing that a minimum of 4 satellites were received at all times, the
position is fixed and the clock requires only one satellite for time transfer. This 1 hour reliability
procedure of the position is initialized every time the clock is switched on and is maintained as
long as a minimum of 4 satellites are not received continuously.