The D5400 thermistor input module is part of the DGH’s D5000 low cost multichannel data acquisition module family. This input module supports up to four channels and converts the thermistor analog input signal to digital data at the rate of 8 conversions per second, then converts the data to engineering units using the lookup tables, storing the latest data in the buffer. Thermocouple type 2252Ω at 25°C is supported. The data can be retrieved by sending an ASCII command from the host computer. For extra security, it utilises a non-volatile EEPROM (Electrically Erasable Programmable Read Only Memory) to store all user-selectable settings, meaning the values are maintained in the event of power loss. The D5400 comes pre-set with default values of 300 baud, one start bit, eight data bits, one stop bit, no parity and any address recognized, but these values can be easily changed by the user. The modules are designed to be compatible with all popular computers utilising RS-232 or RS-485 port and no software is necessary to start using them, although the utility software is provided. The D5400 can be mounted on a DIN-rail if required (MK-1 mounting kit required) and can be combined with other D5000 series modules to build a low cost data logger or a data acquisition system for given application.

• 4 channel Analog-to-digital thermistor input module
• Choice of RS-232 or RS-485 output
• Input: 2252Ω at 25°C type thermistor
• Range: 0°C to 100°C
• Communicates using ASCII protocol
• User-selectable features include °C or °F, analog input range, baud rate, parity type and others
• Accuracy: ±0.1°C
• Resolution: 0.01°C (or °F)
• Input protection to 30Vdc
• Programmable digital filter
• Power requirements: Serial = 0.75W
• Temperature range -25°C to +70°C
• Y2K compliant

The applications for the D5400 data acquisition modules include:

• Process monitoring and control
• Remote data logging to any host computer
• Product testing
• Direct connection to modems