MODEL 1000 SEP 2005
EQUIPMENT DESCRIPTION
2-19
The System Interface and Driver Board provides these functions:
- Drivers for switching the eight optional valve solenoids,
- Location for 8-position DIP switch to set the Modbus address,
- Opto-isolation circuits for the discrete inputs and outputs,
- Switching power supply and temperature shutdown circuit for the LCD display,
- RS-232 to RS-422 conversion for the LCD display, and
- Voltage-to-current conversion for the analog outputs.
- Jumper for selecting driving voltage source for the 4-20 mA circuit.
See drawing CE-18118 for an illustration of the System Interface and Driver board.
Also see Figure 2-5, next page. It illustrates, through a block diagram, the function and placement
of the GC Controller circuit boards.
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