Environmental Modem, Voice Modem

AMASS Data Technologies Inc.

PMDM Environmental Modem,

PMDM/V Environmental Voice Modem

Pliant Technology Specialists

Pliant : readily yielding to influence

Operates from -40°C to +125°C

Powered with +12VDC

VERY Low Power Consumption (power-down mode)
Direct interfaces: HCMOS, RS485 (MODBUS RTU), SDI-12

PMDM: Environmental Modem

PMDM/V: Environmental Voice Modem

Specifications

Environmental Characteristics

Physical Characteristics

Pricing

The PMDM Environmental Modem

The PMDM(/V) Environmental Modems are intelligent devices that are available with a wide variety of communications interfaces.

The principal characteristics of the PMDM and PMDM/V modems are as follows:

12 Volt Operation: Perfect for monitoring stations. Use the same +10.5 to 15 V external battery, charger or power supply as for the data logger.
-40°C to +55°C Operating Temperature Range: Designed to meet and surpass Environment Canada’s requirements.
Low Power Consumption: The PMDM(/V) modems use an idle mode when not in use, thereby reducing their current consumption to about 1 mA.

The PMDM and PMDM/V give your stand-alone devices remote communications capability without having to purchase additional interface equipment. HCMOS, RS232, MODBUS RTU and SDI-12 devices may be connected directly to the PMDM. This added capability is provided with reliability in all foreseeable environmental conditions. Shown below are some examples of the configurations that are possible with the PMDM.

PMDM/V: Voice Modem Advantages

The PMDM/V Voice Modem may be used in Voice-mode or in Data-mode, that is, it can be accessed by telephone or by another modem. The PMDM/V operates in either mode without reconfiguration of any kind.
It does this as follows: The PMDM/V always begins by going off-hook in voice mode. Upon completion of voicing the current data as described below, it attempts to detect a carrier and proceed with an answer handshake. If this is successful within the prescribed timeout (about 20 seconds), it goes on-line in Data-mode, otherwise it hangs-up.
Therefore, telephone and modem access proceed as described below:

Access By Telephone:
The PMDM/V begins by instructing the PDAS to return the most recent sampled data of the sensor assigned to slot #2 of the Sensor Log Table (refer to the user manual for the PDAS loggers and the examples below). This data is then spoken using a professionally recorded voicing system. For example, on data loggers equipped with built-in shaft encoders, the PMDM can be used to speak the current water level. The PMDM/V then fails to detect a carrier (because the user is accessing by telephone) and hangs-up.

Access By Modem:
As always, the PMDM/V begins by defaulting to Voice mode and voices data as described above. To the user accessing by modem, this period will merely appear as a short pause. Upon completion, the PMDM/V will detect the carrier, proceed with the handshaking protocol and go on-line in Data mode. Once connected to the PMDM/V in Data mode, the operation is functionally identical to any other modem.

Specifications

Processor : Cermetek 1794

Baud Rate
9600 default
Up to 14.4 kbaud
Automated baud rate adaptability utilizing speed sensing, flow control, and data buffers

Connectors
· 15 pin DB15P Connector (comm., 12V input)
· RJ11C for telephone line

Power Supply
+10.5 to 15 VDC input for external battery, charger or power supply

Power Consumption
about 1 mA when idle

Physical Characteristics

Height - 152.0 mm. (6.0 in.)
Width - 196.0 mm. (7.75 in.)
Depth - 41.3 mm. (1.625 in.)
Weight : 1 Kg (2.2 lb.)
Mounting : One Mounting bracket, Standard
Use four #10 bolts or screws.

Environmental Characteristics

Operating : -40 to +125 C
Storage : -60 to +100C
Humidity : <= 100% non-condensing

The above information is believed to be true at the time of printing. AMASS Data Technologies Inc. reserves the right to modify specifications without notice. All trademarks are owned by their respective companies.