Model : PM020

GSM Modem: Enfora


Quad Band GSM/GPRS Class 10

Inputs and Outputs:
6 Protected Dry Contact Input 2 Transistor Output (500mA each)
2 Analog Input (0-10V/0-25mA) or NTC Thermistor

Power Input:
External 7V-28V
Optional Built in Rechcargeable Lithium.
Ext RS232C or RS485 for Sensor or Meter Interfacing such as Energy Meter, Flow Transmitter, Gas Transmitter, Analyzers.

110mmL x 91mmW x 37.5mm H


The PM020 was designed for low cost large quantities deployment opportunity with serial interfaces (RS232/485) that can interface to Metering Devices, as well as digital Input such as pulse counting devices, Float Switches, Aux Relay Interfaces, Flood Sensors, Control Panel, Alarm Panel.

The Standard Model PM020 has a FCC/CE approved Quad Band GSM/GPRS Modules (class 10). GPRS can operate as client (remote terminal) or as a GPRS Server (customed firmware).

Built in RS232C Interface (default to System Console Terminal by default) can be optionally factory configure to RS485 that can connects to Metering Devices, PLCs etc as additional custom development services.

It has 6 protected Dry Contact Input, 2 High Current NPN Transistor Sink Output, and 2 Analog Input (4-20mA/0-5V).

The 2 Analog input allows accepting of analog sensors readings such as from Temperature/Humidity, Level Sensors, Water Qualties, Weather Sensors etc.

Optional ZIGBEE/802.15.4 RF (2.4GHZ) can be use to enhance Mesh Networking or wireless sensor networks.

Optional GPS Modules (SuperHigh Sensivity, indoor capable) is optional that allows Geofencing Alert or GPS Accurated Timings.

The PM020 has optional built in lithium battery and charger to eliminate external UPS requirements, such as to continue working even in extreme lower power mode (Hybernate) for extended months of operations. Even with external battery operation,  the PM020 in Hybernate Power save mode can runs for several months or  years depending on the interval of trransmission

Built in USB Interface with HID with a free user friendly Windows Configuration software allows the RTU Alert Unit to be setup easily even by novice users. This eliminate cumbersome Serial port, drivers as well as IP Setup/Security Issues.

PM020 Specification:

6 Digital Input (Dry Contact, Protected)
2 Analog Input (12bit ADC, 4-20mA/0-5V switchable)
2 Digital Transistor Sinking Output
1 x RS232C (optional RS485)
Quad Band GSM Module (GPRS Class 10)
USB HID Interface (no driver installation)
Resettable Fuse Protected DC Output Supply
Built in Lithium Battery and Charger.

Summary Of Features

Powered by 32bit ARM  Risc Controller

End User Alert Mode:   SMS (up to 20 phone numbers)

Support up to 5 Level of Escalations.

Server Alert/Monitoring Mode: SMS, GPRS

Power Supply: DC 7V to 30VDC.

Power Save Mode: 2 Power Save Mode (medium  and Max Save Mode – Hybernate)

PC Interface: USB HID Interface (no driver installation requires)

Serial Interface: 1 x RS232C (factory installed option for RS485)

2 x Digital Drive Output (NPN Transistor, Automotive Grade). Resettable Fuse Protected.

Non Volatile Logger Memory: Total of 1MByte  onboard datalogger memory

Battery Backed Real Time Clock/Calender: Minimum 8 Years battery life.

Number Of Handphone and Emails: 2 Group of 10 phone each

SMS Escalation: Supported (up to 5 levels of SMS Repeat)

SCADA HMI: TSCADA Windows  and Web Base Interface. via GPRS, or Text and PDU SMS Format.

Optional Modules:

GPS: Super Sensitivity Assisted GPS for Asset Tracking. The extremely low power mode of the PM020 consume extremely very low power allows several months to years of standby power.

ZIGBEE/802.15.4 2.4GHZ: Point to Multipoint or ZIGBEE Mesh Network Module to be use as either Gateway or RF End Devices.


Computer Data Center: Monitoring Computer, UPS, PC Server, Water Leak, FM200, Temperature/Humidity.

SCADA System (Water Level, Flood Monitoring, Water Quality (PH, DO, Turbidity, Temp), VOC, TOC and other kind of Sensor Measurement

Weather Stations (Raing Gauge), Slope Movement.

Remote Event Alarm Notification. (UPS, Cold Room, Refrigeration, Electrical, Breaker, Solar Panel, Security Panel, Fire Alarm Panel, Lift Monitoring).


PM020  support dual operating mode :

a) Direct Alert SMS  Message Send to User Handphone.
When Alarm Event occurs, Message are compose and then send directly to user handphone. The number of failed Send SMS can be set to automatically retry sending after a user specified interval. Each User can be alert via SMS . Each Person can be assign to Group, and each group can be assign to combination of inputs that will trigger an alert.
When SMS Acknowledgement is turn on, the user will need to acknowledge SMS or else up to 5 level of SMS will be send at user set intervals. If the SMS are not acknowledge after the maximum duration of acknowledgement windows, the SMS will be escalate to the Escalation group.

b) Server Mode: Send to Testech TSCADA CMS Sotware
When Alarm Event occurs, Message are compose and compressed and then send to Testech HMI Software running at the customer central monitoring PC equipped with a SMS/GPRS Modem and Broadband IP connection. Testech support BOTH Dynamic IP and Static IP.IP Camera can be added to Testech TSCADA SQL Server.

In logging mode or interface to Metering devices, the PM020 regularly read or poll data and send to server using either compressed PDU format SMS, or using GPRS for larger payload packet. 

This means that with our RTU you are assure of the best in both world of operating in standalone mode, Server Mode, and BOTH SIMULTANEOUS User+Server Mode by creating different Phone/IP group on the PM020

The important implication is that our RTU is scalable, allowing customer to gradually scaled up the unit of deployment from standalone base to server base.      


User can send SMS (which has to be validated for a existing phone number in the PM020) can be send to querrie or activate the IO Control, as well as checking the system status including Telco signal strength, status of GPRS Connection, turn ON/ Turn off the Digital Output etc.    

SMS Command supports includes allowing remote authorised Handphone to configure, setup, add/edit/enable/disable/delete handphone numbers etc.                    


Up to 2 Group of 10 Phone Each (that is total of 20 GSM Phone Number) can be setup on the RTU (via RS232C or Keypad)

Group can be set to Server Mode (requires TSCADA HMI Software) or User Mode (diret SMS Message Alert to user Mobile Phone)

Group can be Enable or Disable.

Inputs assignment can be assigned to each Group.  For example if the RTU are connected to mechanical equipments, HVAC and electrical equipment etc and there are different team of maintenance responsible for each category of equipments, you can then alert ONLY the team that are responsible for the particular input that requires service attention when a alarm is send out via SMS

Each group and each individual phone can be individually enable and disable. Inputs can be assigned to different group.


Total of 20 GSM Phone number can be created in the PM020  RTU, by assigning up to 10  Phone Max to Each group (max 2 Groups).

Each Phone can be assign two different privilege mode

Supervisor Phone: Supervisor Phone can configure the unit and send control command to the unit (Turn Alarm ON/OFF, switch RTU to Online GPRS Mode, Switch RTU to OffLine SMS Mode,  Turn Relay On, Snap Pictre, Change Phone Number, Enable/Disable Phone, Enable/DIsable Group)

User Phone: User Phone are only allow to receive alarm message via SMS or Poll the System (for example to check the input status again, or health check).


Input Connector usng high quality 3.8mm Pluggable Industrial Terminal connectors for fast removable screw connects.


Each Input can be individually setup to trigger SMS/EMAIL  on Low, High, Alarm Limit Low or Alarm Limit High.

System and IO Status can be check by sending a SMS message  to check RTU Health Status

System can be ARM, DISARM for maintenance.


Each Analog Input resolutions is 12bit instrumentation grade Aanalog To Digital Converter accepts unipolar (4-20mA/0-5VDC switchable).

Each Analog Input can trigger an alert due to High Limit, Low Limits or both.

Hysterysis allows user to change the band of changes that that it allows allowance as the alarm cross the boundary of each Alarm Limits to capture for Analog sensor that hover around the limits.

Analog Alarm can be assign to individual group.

Each Channel can be individually configure for zero and span, engineering scaling.

Engineering Scaling: The Low Reading and Full Scale Reading can be scaled to user Engieering Units up to 4 digitals + 1 decimal Place (-9.999 to +999.9)

Low Alarm and Hysterisis: Low Alarm can be set with hysterisis (that is if input falls below the Low Alarm trip point), SMS wll be send and the Alarm will only be clear if input reovers to Low Alarm trip point + hysterisis.

High Alarm and Hysterisis: High Alarm can be set with hysterisis (that is if input rises above the High Alarm trip point), SMS wll be send and the Alarm will only be clear if input reovers to Low Alarm trip point + hysterisis.


The ADC can be calibrated by the user by using a Process calibrator. Each ADC has 2 points digital calibration for the best linearity. During calibration, the value read in are compare against against accept value.

PM020 uses FULL Digital calibration and there is no TrimPot or Potentiometer. Therefore the long term stability of ADC reading is very good.


PM020 has High Current 2  Transistor output for driving External Digital Load such as relay, buzzer, siren, PLC etc.   The digital output Configuration allows the output to be driven base on input conditon or SMS. Output can have a user set pulse timming.

USB Windows Interface

The PM020 is unique in the sense that it has a built in USB HID (Human Interface Device) that is supported by all version of windows since windows XP, Vista, Windows7. This allows fast communication interface to PC and supported by a free windows configuration software that allows even novice users to be able to setup the RTU with ease.

Changes made can be save into PM20 interval Non Volatile Memory to permanently store the setup.


All Event (System Login, System Reset, IO Event, Send SMS Operations etc) are logged and save in battery backup memory. By Default, up to 100 event are individually time stamed and store in the event log in the internal non volatile Flash Memories, and using the addtional built in 2MByte Non Volatile Flash Memories, unlimited event log is possible.

RS232C / RS485

The PM020  has a  External RS232C (factory installed option to change to RS485) to allow interface to external Metering Devices, Sensors, PCs., Please talk to us for any custom interfacing including ModBus Protocol, Hart Communcation protocol.


The WebBase or Windows Base are SCADA developed by Testech Electronics has allows many units of PM020 to be monitor from one central server using enterprise level SQL server. User Phones/Email are store on the Server, and the unit monitor and logs all the RTU on 24/7 basis.

Specific custom HMI has been developed for Data Monitoring, Water Qualities, Flood level Monitoring, Weather Stations,  Turbidity sensors, Volatile Organic Compound, RainGauge etc. Each parameter of the SCADA IOs can be modify to suit user sensors.

TSCADA support DVR and IP Camera for real time streaming videos integrated into the SCADA remote Monitoring.

Contact us for free consultation for your custom projects.

Link to TSCADA