Modems, Tranfer Modules, & GOES Satellite communications are available. Please inquire about methods of communication integrated into any system or using individual monitors, sensors and/or counters.

A variety of communications options are available for Met One Instruments’ products. These include direct wire connections, telephone line dial-up, cellular dial-up as well as radio communications.

Communication PDFs


AX/MX-996 1200/9600 Baud Dial-up Modem

AX/MX-996 Basic Modem

The AX-996 is a special low power dial-up communications modem for use with the AutoMet data logger. It can operate at either 1200 or 9600 baud when connected to a public switched telephone network (standard telephone lines) or with the AX-911 Cellular Telephone Interface. It is powered from 12 VDC and is setup as an auto-answer modem. It provides full-duplex operation over standard analog phone lines. This modem is designed for high reliability and does not require any software initialization codes that are required by standard PC and home type modems for them to operate correctly since they are not designed for connection to data loggers. Following a communications link-up and data transfer, the modem will release the connection when the calling stations hangs up the telephone line. The modem will work with any standard PC modem. To use the MicroMet Plus software a Hayes Compatible PC modem is required. The AX-996 modem is directly connected to the RS-232 output of the AutoMet data logger with a short cable and is mounted inside the data logger enclosure. It works with standards BELL 212A, CCITT V.22, V.32bis protocols. MX-996 is for MicroMet Datalogger.

AX-991 Spread Spectrum Radio Set

AX-991 Radio Modem ( without enclosure )

The Spread Spectrum Radio Set Model AX-991 provides a direct radio link between a centrally located PC and one or more remotely located data loggers. When used in the United States and several other countries, no FCC license or government permits are required. Normally supplied as a pair of radio links, additional remote station units can be provided for multi-station systems. In a simple radio pair system communications is continuous between the central and remote. In networked operation, each remote site is polled from the central. The typical maximum line-of-sight range of the AX-991 radio is approximately 20 miles (32 km).

Each radio system includes radio modems, 30 ft of low loss coax, and a high gain Yagi antenna for maximum communications range. The spread spectrum radios operate in the 902-928 mHz range using a frequency hopping technology. They operate Asynchronous, Full duplex at baud rates from 1200 to 115.2 kBaud. The remote radio is mounted inside the AutoMet Data Logger. Average power required is 180 mA at 10.5 to 18.0 VDC.

UX-992 Short Range Spread Spectrum Radio Set

UX-992 Radio Set ( without enclosure )

For shorter distances and point to point communications the UX-992 Spread Spectrum Radio set can be used. It provides a reliable RS-232 connection between the AutoMet Data Logger and PC Computer, or other display devices. Operating in the 900 mHz range, the UX-992 requires no FCC license for use in the United States and many other countries. As an option, a 2.4 GHz version is available. Maximum baud rate with the AutoMet Logger is 9600 Baud. The radio is mounted inside the logger enclosure with a small external antenna for short range operation. For operation up to 10 miles (15 Km), a small directional Yagi can be used at each end of the communications link.

The small low cost radio link can be used to collect data from a remote logger by simply driving up near the site in your vehicle and then using a laptop to extract the data from the logger. Simply set the receiver unit on the dash of the automobile, and connect the RS-232 output to your laptop. Typically supplied as a pair with 10 ft low loss coax cables, and two small Yagi directional antennas. Other custom configurations of the radio sets are available.

AX-911 Cellular Telephone Interface

AX-911 Typical set of analog components

When there are no telephone lines or the standard line of sight radio communication is not usable, another alternative is the AX-911 Cellular Telephone Interface. The standard cellular package consists of a AMPS (Analog) 2 Watt cellular telephone, gain antenna, and a special data interface that connects to the AX-996 Dialup Modem. Because of the power requirements, a timer unit is provided to control the times when the radio unit is activated. Various preselected communications times can be set so that during these time windows the cellular radio is activated and communications to the remote site can be made. When power is available, this feature can be shut off for continuous cellular connection. System includes a multi-element Yagi antenna for best signal capture and transmission to cellular tower.


CDMA Data Link

Optional CDMA, GPRS and GSM cellular digital telephone systems can be provided. Additional information on these cellular systems can be obtained from Met One Instruments.

All cellular telephones will require activation in the operational area by your selected provider.

AX-969 Short Haul Modem Set

AX-969 Modem

When distances longer than the 50 ft line length restrictions of an RS-232 connection is required. The short haul modem set can be used. The AX-969 Short Haul modem set can be used for connections of up to 7 miles in length. Using two twisted copper pairs of wire, a reliable data link between the two modems can be made.

Each modem includes transformer coupled links and opto-isolated RS-232 connections. Modem power is taken from the PC computer at one end and the data logger RS-232 port at the remote station. Typical minimum wire gauge between modems is 24 AWG with 22 and 19 AWG being most common. Central site short haul modem can be plugged directly into 25-pin RS-232 connection of the
PC Computer.

UX-961 Data Transfer Module

UX-961 Transfer Module

The UX-961 Data Transfer Module is a simple convenient method for transferring data from the AutoMet Data Logger to a PC Computer. Plug the transfer module into the serial port of the data logger using the special interface cable supplied. Activate the transfer of data from the front panel display and keyboard of the logger. In just a few minutes all of the data contained in the logger will be transferred to the module. Once the data has been collected the module can then be taken to the PC computer where it is extracted using MMP (MicroMet Plus) Software.

The simplicity of the operation allows almost anyone to retrieve data without having to take your laptop computer to the data logger when it might be raining

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