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Product information Wireless data loggers
Components of the system
The system consists of the following components:
- HD35AP...: base unit
- HD35RE...: repeaters
- HD35ED...: series of data loggers
- HD35ED-ALM: remote alarm module
HD35AP... base unit: the base unit is the interface between the data loggers of the system, placed in the measurement sites, and the PC.
It communicates wirelessly with the remote data loggers.
When connected to the PC via the USB connection, the base unit is directly powered by the PC USB port. In the absence of the
USB connection, the power is supplied by the internal rechargeable battery or by the external power adapter (optional). The use
of the external power adapter is necessary with the HD35APW and HD35APG.../HD35AP3G... versions.
HD35RE... repeaters: the repeaters are devices able to act as a bridge between the base unit HD35AP... and the remote data loggers HD-
35ED.... They allow the increase of the communication distance among the data loggers and the base unit. More repeaters can be
interposed between a data logger and the base unit to further increase the communication distance.
HD35ED... series of data loggers: the data loggers are the remote devices connected to the measuring probes. They are installed in
the environments to be monitored and are powered by the internal battery (not rechargeable) that allows a long working life.
The acquired measurements are stored in the internal memory and sent to the base unit automatically at regular intervals or
upon user request. Versions with or without LCD are available. The versions with LCD allow the measurements and the RF signal
quality to be viewed also at the installation site and allow the data logger configuration through the front keyboard too.
HD35ED-ALM remote alarm module: With relay outputs, the module allows to activate signalling devices (sirens, blinking lights, etc.)
or actuators.
The system can consist of up to 255 devices (including the base unit and any repeaters). Each device is uniquely identified by its own
address.
Thanks to the wireless transmission, the installation of the system is extremely simple and quick. The absence of cables allows a consid-
erable saving in cost of material and labor, and allows the system components to be moved at any time without problems. Furthermore,
it is not necessary to remove the data logger from its place or to go to the installation site to download the measured data into the PC.
Unit base versions
The base unit is available in the following versions:
- HD35AP, with the USB output only.
- HD35APD, with the USB output only. "Dongle" version powered only by the PC USB port (without internal battery and without input
for the external power supply).
- HD35APS, with:
o USB output
o RS485 output with MODBUS-RTU protocol
The base unit acts as a multiplexer to address the MODBUS commands from the PC/PLC to the devices in the network.
- HD35APW, with:
o USB output
o Wi-Fi interface for the connection to the wireless local network
o Ethernet interface for the cable connection to the local network
Permits (if the Internet connection via local network is available) sending alarm e-mail and the recorded data via e-mail, to an FTP ad-
dress and to an HTTP server (Cloud). The internal clock can be regularly synchronized automatically with a NIST reference server.
Allows using the MODBUS TCP/IP protocol (version of the MODBUS protocol for the communication via the Ethernet connection).
Multi-client feature: multiple PCs can be connected simultaneously via TCP/IP to the same base unit.
- HD35APR, version for 35 mm DIN rail, with:
o USB output
o RS485 output with MODBUS-RTU protocol
o Ethernet interface for the cable connection to the local network
The base unit acts as a multiplexer to address the MODBUS commands from the PC/PLC to the devices in the network.
Permits (if the Internet connection via local network is available) sending alarm e-mail and the recorded data via e-mail, to an FTP
address and to an HTTP server (Cloud).
Allows using the MODBUS TCP/IP protocol (version of the MODBUS protocol for the communication via the Ethernet connection).
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