The Sensor Controller for Massive Monitoring 1000 is the main component of the Sysacom Sensors Network Solution. The SCMM1000 interfaces with a large quantity of sensors to a PC through Ethernet, USB or RS-232. It also provides 8 digital inputs and 8 digital outputs. The SCMM1000 is networked using many miles of wire between the controllers and the PC, this allows for an extensive connection to distant locations. Additionally, the SCMM1000 can connect directly to the Internet through the Ethernet port using the proprietary Sysacom network stack.

The SCMM1000's are connected to each other using modems operating on a leased line (simple two-wire connection without voltage). There are three MODEM ports to enable complex network structure.

The next figure shows a single controller connection to sensors, inputs and outputs. Note that all the SCMM1000 controllers in the network have this capability, so that many hundreds of sensors can be interfaced. There are two two-wire sensor interfaces to sensors, and each can support up to 63 sensors, such as the TPS1001, TPS1002 or TPS1003. The two-wire sensor interface provides DC power to the sensors as well as a data path for communicating the read values.

Digital inputs are isolated and protected. They are used for reading dry contact. Digital outputs are also isolated and are used to drive relays.

Product Model

The picture below shows the SCMM1000 in its entirety, complete with its patch panel. Note that the SCMM1000 has an LCD display to show controller and sensor lines statuses. All field connections are done through the patch panel, each with a respective protection device. The SCMM1000 is powered by an external 12VDC power supply.

The  SCMM1000 controller  provides:

• Interface to our temperature and pressure sensor TPS1001, TPS1002 or TPS1003..

• A communication interface to a PC either through RS-232, USB or Ethernet.

• Three analog line interfaces for leased line communication in between up to 15 controllers, for a total of 1890 sensors.

• Two sensor line interfaces, each supporting 63 sensors.

• Eight digital outputs for controlling remote relay.

• Eight digital inputs for detecting remote contact closure.

• Display 4 rows by 20 columns with backlight.

• A connector for ON/OFF switch,

• One buzzer.

For an understanding of the different types of applications please visit the following:

Maple Syrup - http://www.acertronix.com

Refrigeration -

Control Rooms - 

 

Ethernet

• 10/100MBPS, PowerJack T12 from Pulse engineering.

USB

• Use USB/SPI adapter model USC-205 from Sysacom

RS232

• 19200bps, 8 data, no parity, one stop bit.

• Capable up to 115200bps.

• Support MODEM signals.

• Two connectors one for MODEM the other for direct PC connection.

Analog Line Interface

• Use the CMX868A modem IC with related circuit.

•  Bit rate of 1200bps.

• Primary protection added on the patch panel.

• Secondary protection added on the main board.

• This interface is only for leased line, with no DC bias.

Two-wire sensor line interface

The Controller provides two complete interface to the two-wire sensor interfaces each one supporting up to 63 sensors, such as the TPS1001, TPS1002 or TPS1003..

   

Digital Input

• Driven by a ground.

• Threshold at 6+/-2V.

• Hysteresis of 0V.

• Protect against +/-24V continuous (on patch board).

• Sink less than 10mA.

Digital Output  

• Maximum current 140mA.

• Over current and short circuit protected.

• Drive inductive load.

• Optically isolated.

Power Input

• Accept 12+/-2Vdc