Feature #884

UART protocol between front panel board and digital board.

Added by tin over 5 years ago. Updated over 4 years ago.

Status:ClosedStart date:28/12/2013
Priority:NormalDue date:
Assignee:tin% Done:


Target version:Keithley 2001 #6


All display and key data transfer between CPU and front panel board is done by UART interface

Captured log example attached.
Display data transfered in ASCII + control bytes for blinking/special segments, etc.

R603,R604 on signal lines was probed with CP2103 USB-UART bridge
Settings: 8N1 9600 baudrate

Easy to use for custom application if perform full decode for protocol.

Requirement for front-panel board and VFD:

  • +5.5VAC with center tap for filament
  • +60 VDC for segment drive
  • +5VDC for controller and logic
  • 4MHz clock
  • System reset signal line

display_pattern_test (28.1 KB) tin, 28/12/2013 19:11


#1 Updated by tin about 5 years ago

  • Target version changed from Keithley 2001 #7 to Keithley 2001 #6

#2 Updated by tin over 4 years ago

  • Status changed from Resolved to Closed

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