VC3500/VC3700 Troubleshooting Manual
Valco Cincinnati
Page 11
Scanner Lockout Function
U18 (87C51) provides the Scanner Lockout function and Jam Indication for Channels 1 & 2.
Channel Logic Function
U20 (87C51) provides the Channel Logic function for Channel 1. U19 (87C51) provides the
Channel Logic function for Channel 2.
Analog Pressure Circuit
A buffered representation of the sensed air pressure ("ANALOG BAR GRAPH" from U4.7
of the Analog board) is presented to the positive input of an A/D converter (U21 -
LTC1096). The serial output of this device is read by the 68000 through port PB0 of U17.
The 68000 uses this information to size the length of the pressure bar graph on the
LCD/Touchscreen.
Summary of Contents for VC3500
Page 1: ...VC3500 User s Manual Software Version 3 X Manual Number MCO35 Manual Release Date July 1999 ...
Page 19: ...Installation VC3500 User s Manual Valco Cincinnati 16 Figure 8 Internal Connections Diagram ...
Page 88: ...VC3700 User s Manual Software Version 3 X Manual Number MCO34 Manual Release Date July 1999 ...
Page 181: ...VC3500 VC3700 Troubleshooting Manual Manual Number MC048 Release Date May 1999 ...
Page 185: ...VC3500 VC3700 Troubleshooting Manual Valco Cincinnati Page 1 System Level Documents ...