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GSM Remote control with Python: power and easy of use

Publication Date: 16-11-2006 | Versione Italiana  | English Version
Tags: - Python - Schede Area SX - Telecontrollo -

SX-PY board is surely the easiest and most powerful GSM/GPRS remote control system that you can imagine: it is based on TELIT GM862-PY modem with Python interpreter on board and It encloses in a 9 DIN rail modules case: 2 optocoupled inputs, 2 relays outputs, an RS232 serial port, a debug serial port, 2 expander connectors, backup battery with power fail detection and more The module is programmable with simple Python scripts to be uploaded through the serial port, and it allows also users with no specific experience to easily realize remote control systems via GSM/SMS/GPRS.
And its not enough: this board allows to change the GM862-PY module with the GM862-GPS one that, besides the described previous features, supports also a GPS receiver for localization applications.

SX-PY board with modem on board
(Click on the picture to enlarge it)

Hardware overview

Telit GM862-PY modems (you may find an application based on Telit modem in this article: How to execute a Phyton script with Telit ) are very powerful: they, not only work very well as quad band modem, but also support a Python interpreter with 3MB Flash Memory and 1.5MB RAM, 2 serial ports and 13 input/output serial lines: just one problem is using the modem without a specific hardware capable to support power supply and peripherals lines on the very small Molex connector.
SX-PY is the solution to these problems, a board developed with power and simplicity in mind: in fact all the features of GM862 module are available, ready to be used in our projects.

The modem, as mentioned, may be programmed with Python script, a wide spread language and vary easy to use: many dedicated web sites are available with all the needed information, e.g. www.python.it or www.python.org.
Python interpreter onboard already supports all the library for hardware control (e.g. to send commands to the modem and to receive responses), so allowing a fast use of all the features without any need of rewriting low level functions.
Programming the GM862 modem on board of SX-PY is executed through serial port, using AT commands: to make this operation easier, Area SX provides also a free software with a simple graphical interface (SxPyDownloadTool :Python script management for Telit modem engines).

SX-PY board with modem
(Click on the picture to enlarge it)

Main features of the SX-PY board are:

  • Filtered power supply in large range 9-15V AC/DC
  • Backup battery (not included) connector with recharge circuit
  • Power fail detection
  • Battery left charge level retrievable in Python scripts using AT commands
  • GPS receiver (available using only GM862-GPS module)
  • RS232 Serial port for script upload
  • RS232 Serial port for script debug
  • 2 optocoupled and configurable input lines
  • 2 relays output (48V/2A)
  • Flex expander for SX16B board (SX16B - IN/OUT expansion board) to enlarge inputs and outputs number
  • Expander for proprietary hardware connection
  • Connector for RF serial module ER400TRS (Trasmissioni in Radiofrequenza facili con Easy Radio)
  • Reset button
  • Test button
  • LEDs for power, battery charge, GSM network, RF data transfer and test

Hardware detail

All the peripherals and interfaces on board are well designed, in particular some of them deserve a more accurate view.

Power supply section

Power supply section supports a wide range voltage both DC and AC and a strong filter. This allows a very good noise rejection that may pass on power line because of electromagnetic interference.
This section is completed by a connector for backup battery with related recharge circuit; battery charge level and power supply status are directly monitored by modem AT commands and so available in our scripts. When power supply fails, backup battery automatically works; power is ensured to modem and, optionally, to expander bus while the remaining hardware is turned off: in this condition the device may work for 36 hours and more.

Inputs and outputs

The two inputs on board may be configured one different from the other. In particular it is possible to use completely optocoupled inputs supporting also no-polarized voltage or voltage-free inputs. Relays outputs can drive loads with voltage up to 48V and peak current of 2A.

DCE Serial

On the standard 9 pin female connector you find a complete serial port, straight connected to the modem. Using this serial port, you can control the modem from external application and upload Python scripts.

Debug serial

Above all the features, one very important to easily use a programmable system is surely the chance to have a debug interface for your source code. SX-PY board supports this feature with debug serial port that allows to control script running during a test phase. This serial port is placed on a 5x2 pins connector to be used with a flat cable with a crimped serial connector.

RF serial and expanders

Board equipment is completed by a RF (433MHz) wireless serial slot and two expander connectors: the first allows a straight link to FLEX interface boards, such as SX16B, as mentioned before (SX16B - IN/OUT expansion board) or FLEX Analog (FLEX-Analog: an analog acquisition board with flexibility in mind!). The second allows the proprietary hardware connection, supporting 8 input/output lines and power supply line; this one may be both +5V or +3.7V with backup power supply from a battery to ensure reliability.

Input and output expansion

SX-PY board has a connector for straight link to SX16B board (SX16B - IN/OUT expansion board): this way 24 inputs, 6 relay outputs and a temperature sensor ara available for Python scripts control. Moreover, since SX16B is very flexible and scalable, you can connect several boars in a cascade configuration to realize a further input/output expansion. You can use the same connector to link FLEX Analog board (FLEX-Analog: an analog acquisition board with flexibility in mind!) to support 8 A/D inputs and 2 D/A outputs with 8 bit resolution.

SX-PY board connected to SX16B board
(Click on the picture to enlarge it)

Cases

SX-PY board, as the SX16B one, may be placed in a 9 modules DIN rail case. This makes the board very suitable to be used in electric panels to realize remote control systems, surveillance and automation in houses or industrial environments.

SX-PY board connected to SX16B using their cases
(Click on the picture to enlarge it)

Test scripts

How to use the SX-PY board

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Tags: - Python - Schede Area SX - Telecontrollo -

Publication Date: 16-11-2006Hits: 79860
I marchi citati sono propriet dei titolari dei relativi diritti. Le caratteristiche tecniche e i prezzi riportati sono indicativi e soggetti a variazioni senza preavviso. Le foto non hanno valore contrattuale. Nonostante accurate verifiche, il presente documento pu contenere prezzi o specifiche errati. Area SX si scusa in anticipo e si impegna ad evitare tali imprecisioni.

 Area SX store
In this section you can buy directly the products described in this article
SXPY;SXPY_KIT;SXPY_GPS_KIT
All prices are indicated in Euros without shipping costs and VAT (where applicable). The prices are for single unit.
DescriptionCodeUnit Price
Read more info on this productGSM/GPRS remote control engine with Python interpreter
SMS/GSM/GPRS remote control board
Main features:
  • Wide range power supply (9-15V CC/CA)
  • Backup battery (not included) with charge circuit
  • RS232 serial line
  • RS232 debug serial line
  • 2 optoisolated inputs
  • 2 rele outputs (48V/2A)
  • 3 expanders
  • 1 host for serial/radiofrequency converter ER400TRS

Modem GM862-PY not included
Can host also the GM862-GPS module with embedded GPS receiver
DISCOUNT AVAILABLE UNTIL THE END OF STOCK


Prodotto compliant RoHs
SXPY€ 140.00
€ 73.00
Read more info on this productRead more info on this product
Read more info on this productSXPY Development Kit
The SXPY development kit is the perfect solution to start with the Python enabled Telit Modems.

The kit includes all the hardware and software tools needed to build your own GSM remote control system.

The kit content:
  • Telit GM862-PY Modem
  • SXPY board
  • Lithium batttery 3.7V 900mA/h
  • power Supply 220V - 12V 500mA
  • serial flat cable
  • GSM antenna
  • A DIN rail mounted enclosure
  • CD with documentation and examples

DISCOUNT AVAILABLE UNTIL THE END OF STOCK


Prodotto compliant RoHs
SXPY_KIT€ 295.00
€ 165.00
Read more info on this productRead more info on this product
Read more info on this productSXPY development kit with GPS receiver
The SXPY development kit is the perfect solution to start with the Python enabled Telit Modems with integrated GPS receiver.

The kit includes all the hardware and software tools needed to build your own GSM remote control system.

The GPS kit content:
  • Telit GM862-GPS Modem
  • SXPY board
  • Lithium batttery 3.7V 900mA/h
  • power Supply 220V - 12V 500mA
  • GPS antenna
  • GSM antenna
  • A DIN rail mounted enclosure
  • CD with documentation and examples

DISCOUNT AVAILABLE UNTIL THE END OF STOCK


Prodotto compliant RoHs
SXPY_GPS_KIT€ 335.00
€ 195.00
Read more info on this productRead more info on this product

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