RS232 is a point-to-point serial interface for connecting a sensor or transmitter directly to a single PC, PLC, BMS or data logger over a short cable run (typically up to ~15m) — no network, gateway or extra hardware required. It’s the simplest way to feed a live reading into an existing control system or logging setup.
Our COMET RS232 range measures temperature, relative humidity, CO2 and barometric pressure — individually or combined — as compact transmitters and relay-output units for laboratories, cleanrooms, server rooms, greenhouses and industrial process areas where a direct wired connection to existing equipment is preferred over a network output.
Each unit is a standalone industrial instrument with its own sensor element and RS232 output — not a PC accessory or logging program. Configuration is done once via COMET’s free setup software over the same cable; day-to-day, the transmitter streams live readings to whatever RS232 device or software you connect it to.
RS232 is a point-to-point serial interface for connecting a sensor or transmitter directly...
Temperature and humidity probe with RS232 output,…
Temperature and humidity probe with RS232 output<...
Temperature transmitter with RS232 output
Barometric pressure transmitter – RS232 out…
Industrial temperature and humidity transmitter &…
Temperature transmitter with RS232 interface
CO2 concentration transmitter with RS2…
CO2 concentration transmitter with RS2…
Temperature, humidity, CO2 transmitter…
Industrial temperature, humidity, barometric pres…
Industrial temperature, humidity, bar. pressure t…
Temperature and humidity regulator with RS232 out…
Temperature transmitter with RS232 output
CO2 concentration transmitter with RS2…
CO2 concentration transmitter with RS2…
Choose by parameter and whether you need relay outputs for local alarms (H-series).
Need a longer or multi-drop cable run? See our RS485 range.
Prefer a networked or wireless output instead? See Ethernet, PoE or WiFi Sensors.
Need a standalone logger with its own onboard storage rather than a live serial feed? See our Data Loggers range.
We stock and calibrate the full COMET range in Australia, with NATA-accredited calibration certificates included.
Hardware. Each COMET RS232 product is a standalone temperature, humidity, CO2 or pressure transmitter with its own sensor element — not a PC accessory or logging program. It streams live readings over its RS232 output to whatever PC, PLC, BMS or data logger you connect it to.
RS232 is a point-to-point link — one transmitter to one device, over a shorter cable run (typically up to ~15m). RS485 supports longer cable runs and multiple devices on a shared bus (multi-drop), better suited to larger sites with several sensors reporting to one controller. See our RS485 range for multi-drop or longer-distance installations.
Yes — that's the primary use case. The transmitter streams live readings over its RS232 port, which most PLCs, BMS platforms and third-party data loggers with a serial input can read directly.
COMET's free configuration software is used once, over the same RS232 cable, to set parameters like averaging interval, units and relay thresholds. Day-to-day operation needs no PC or software — the transmitter simply streams live data to whatever's connected.
The H-series (H4331 temperature, H6320 temperature/humidity/CO2, H5321 and H5324 CO2) add relay outputs alongside RS232, for driving a local alarm, fan or damper directly from the transmitter without an external controller. H3331 instead adds 3 state inputs and works as a temperature/humidity regulator rather than a simple relay-alarm transmitter.
Yes — the range includes combined temperature & humidity, temperature/humidity/CO2, and temperature/humidity/pressure models, as well as single-parameter temperature, pressure and CO2 transmitters.
Yes. Pacific Sensor Technologies holds local stock, ships Australia-wide, and calibrates through our own NATA-accredited lab — so setup help, service and recalibration don't depend on overseas turnaround.
