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Analog Voltage
Inputs (Optional)
Digital Relay
Digital Inputs
Serial Ports
Thermo Fisher Scientific
outputs are isolated from the instrument power and ground, but they share
a common return line (Isolated GND).
The optional I/O expansion board includes eight analog voltage inputs.
These inputs are used to gather measurement data from third-party devices
such as meteorological equipment. The user may assign a label, unit, and a
voltage to user-defined unit conversion table (up to 16 points). All voltage
inputs have a resolution of 12 bits over the range of 0 to 10 volts.
The instrument includes one power fail relay on motherboard and ten
digital output relays on the digital output board. These are reed relays rated
Outputs
for at least 500 mA @ 200VDC.
The power fail relay is Form C (both normally opened and normally closed
contacts). All other relays are Form A (normally opened contacts) and are
used to provide alarm status and mode information from the analyzer, as
well as remote control to other devices, such as for controlling valves during
calibration. The user may select what information is sent out each relay and
whether the active state is opened or closed.
Sixteen digital inputs are available which may be programmed to signal
instrument modes and special conditions including:
Zero Gas Mode
●
Span Gas Mode
●
The actual use of these inputs will vary based on analyzer configuration.
The digital inputs are TTL level compatible and are pulled up within the
analyzer. The active state can be user defined in firmware.
Two serial ports allow daisy chaining so that multiple analyzers may be
linked using one PC serial port.
The standard bi-directional serial interface can be configured for either RS-
232 or RS-485. The serial baud rate is user selectable in firmware for
standard speeds from 1200 to 19,200 baud. The user can also set the data
bits, parity, and stop bits. The following protocols are supported:
C-Link
●
MODBUS Slave
●
Geysitech (Bayern-Hessen)
●
Streaming Data
●
Model 48i Trace Level-Enhanced Instruction Manual
System Description
I/O Components
8-9
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Troubleshooting
