- The most unknown atomic clock requests per day serial#
- The most unknown atomic clock requests per day driver#
The driver code converts the time back to UTC. In the default or original MSF mode, the time is in `local' format, including the daylight savings adjustment when it is in effect. The clock responds at the start of the next second (with the start bit of the first byte being on-time). The driver interrogates the clock at each poll (ie every 64s by default) for a timestamp. Look at the notes at the start of the code for further information some of the more important details follow. Information on the WWVB version is available from Atomic Time as their Atomic Time PC. There is support for a Tcl/Tk monitor written by Derek Mulcahy that examines the output stats see the ARC Rugby MSF Receiver page for more details and the code. Christopher Price added enhanced support for the MSF, DCF and WWVB clocks. Paul Alfille added support for the WWVB clock. Thanks also to Lyndon David for some of the specifications of the clock. The code was originally made to work with the clock by Derek Mulcahy, with modifications by Damon Hart-Davis. Much of this code is originally from the other refclock driver files with thanks. This driver is designed to allow the unit to run from batteries as designed, for something approaching the 2.5 years expected in the usual stand-alone mode, but no battery-life measurements have been taken. This code has been significantly slimmed down since the V1.0 version, roughly halving the memory footprint of its code and data. For a to-do list see the comments at the start of the code. That code will claimed increased stability, reduced jitter and more efficiency (fewer context switches) with the tty_clk discipline/STREAMS module installed, but this has not been tested. The previous documentation described version V1.1 (3) of the source and had been tested (amongst others) against ntpd3-5.90 on Solaris-1 (SunOS 4.1.3_U1 on an SS1 serving as a router and firewall) and against ntpd3-5.90 on Solaris-2.5 (on a SS1+ and TurboSPARC 170MHz). This should assure backwards compatibility and should not break existing setups. If the mode flag is 0, or unspecified, the original MSF version is assumed. To use the alternate modes, the mode flag must be specified. In all other respects, the driver works as per v1.1 if a mode is not specified. Changes from v1.1 and v1.2 include patches to work with the new ntp-4 code, clock support for DCF and WWVB configurable via mode flag, an option to ignore resync request (for those of us at the fringes of the WWVB signal, for instance), averaging of the signal quality poll and several bug fixes, code cleanup and standardizations. This documentation describes v1.3 (1) of the source and has been tested against ntpd 4.1.0 on linux x86. The clock reports its ID as " MSFa'', " MSF'', " DCF'' or " WWVB'' to indicate the time source. This driver supports the Arcron MSF, DCF and WWVB receivers.
The most unknown atomic clock requests per day serial#
Serial Port: /dev/arc u 300 baud, 8-bits, 2-stop, no parity
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