Thermo Scientific 42i Instruction Manual page 239

Front Panel Connector
I/O Components
Analog Voltage
Thermo Fisher Scientific
voltage range of 0V to 10VDC. Six current outputs are provided with a
normal operating range of 0 to 20 mA.
The front panel connector board interfaces between the motherboard and
the front panel mounted function key panel and Graphics display. It serves
Board
as central location to tie the three connectors required for the function key
panel, the graphics display control lines, and the graphics display backlight
to a single ribbon cable extending back to the motherboard. This board
also includes signal buffers for the graphics display control signals and a
high voltage power supply for the graphics display backlight.
External I/O is driven from a generic bus that is capable of controlling the
following devices:
Analog output (voltage and current)
●
Analog input (voltage)
●
Digital output (TTL levels)
●
Digital input (TTL levels)
●
Note The instrument has spare solenoid valve drivers and I/O support for
future expansion.
The instrument provides six analog voltage outputs. Each may be software
configured for any one of the following ranges, while maintaining a
Outputs
minimum resolution of 12 bits:
0-100mV
●
0-1V
●
0-5V
●
0-10V
●
The user can calibrate each analog output zero and span point through the
firmware. At least 5% of full-scale over and under range are also supported,
but may be overridden in the firmware, if required.
The analog outputs may be assigned to any measurement or diagnostic
channel with a user-defined range in the units of the selected parameter.
The voltage outputs are independent of the current outputs.
▲
System Description
I/O Components
Model 42i Instruction Manual 8-9