System Description
I/O Components
Thermo Fisher Scientific
Model 15
i
Instruction Manual
8-9
The instrument includes one power fail relay on the motherboard and ten
digital output relays on the digital output board. These are reed relays rated
for at least 500 mA @ 200 VDC.
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 from 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 (opens zero solenoid)
●
Span Gas Mode (opens span solenoid)
●
Set Background (sets zero)
●
Cal to Low Span (sets low span coefficient)
●
Cal to High Span (sets high span coefficient)
●
Analog outputs to zero
●
Analog outputs to full-scale
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 the firmware for
standard speeds from 1200 to 115200 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
Digital Relay
Outputs
Digital Inputs
Serial Ports
Содержание 15i
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