Master clock protocol driver for IBM and Simplex slave clocks from an Arduino. This is a fork of Phil Hord's original code, available at:

https://github.com/phord/master_clock

This version has been extensively modified and in some places rewritten.

• The code now compiles with recent versions (1.6.5) of the Arduino IDE. Current UDP/NTP libraries are now used.

• Configuration settings have been moved to a new file, config.h. It should no longer be necessary to edit various constants scattered throughout the source.

• Support for Simplex clocks has been added. This support drives an additional pair of pins.

• Support for IBM synchronous clocks with second hands has been added. This support drives one additional pin.

• Daylight savings time support has been added. The tables and associated settings are in config.h.

• Support for tracking clock settings through power outages has been added.

• Support for talking to the clock via telnet has been added. The port used for this is specified in config.h. This presents the same console interface as the serial port.

• The console mode has been extensively revised. All commands can now be preceded with an unsigned number N. The available commands are:

  • N, n - manual trigger of NTP sync
  • < - Slow the clock down for simulation runs
  • > - Speeds the clock up for simulation runs
  • + - Advance the digital clock minute
  • -, _ - Decrement the digital clock minute
  • H, h - Set hour value to N
  • M, m - Set minute value to N
  • S, s - Set second value to N
  • A, a - Send N A pulses to IBM slave clocks (default 1)
  • B, b - Send N B pulses to IBM slave clocks (default 1)
  • C, c - Send N combined A/B pulses to IBM slave clocks (default 1)
  • D, d - Send N pulses to Simplex clocks (default 1)
  • E, e - Send reset command to Simplex clocks
  • f - Turn on reset solenoid on IBM synchronous clocks
  • F - Turn off reset solenoid on IBM synchronous clocks
  • I, i - Hold IBM slave and Simplex clocks for N seconds (default 3600)
  • U, u - Hold IBM slave clocks for N seconds (default 3600)
  • V, v - Hold Simplex clocks for N seconds (default 3600)

Important note: The PC test/simulator code is still present in the repo but has NOT been maintained. As a result it is guaranteed not to build.