Enhanced security is a major feature of the SEC, an unique finger print code allows the machine to detect any meter changes and to prevent operation if the meter is not present. By utilising the latest electronic technology, the SEC avoids the reliability problems and service call-outs which can be experienced with mechanical counting devices.

The SEC has up to 31 counters available (indexed as counter 0 to counter 30, (0 to 1E Hex) stored in a non-volatile EEprom device. Each counter can store values from 0 to 9,999,999, which can be displayed on a 7 digit, 7-segment LCD display.

Each counter also has 7 text characters associated with it that can be displayed when the counters are cycled, enabling individual counter readings to be easily located and logged by the operator. The text can be changed by the host machine, enabling the counter unit to be configured for different languages or different counter uses as it is moved from the host machine to another.

The counters are managed under host control via a clocked serial link. The host can use as many of the 31 counter as is required, the counter cannot be cleared to zero or decremented under normal circumstances. The lifetime of the unit is specified as a minimum of 9,999,999 single increments on any counter.

During normal operation, the SEC will display the contents of the counter 0 (default) on the LCD display. The host can also control the LCD display directly, enabling text and counters to be shown in any user-defined order, or to show text messages from the host machine.

Communications

Communications security is by the use of checksums for each command packet sent to the SEC. The checksum is an 8-bit sum of the other words that make up the command packet (i.e. CMD, ID, CNT and any data bytes), ignoring any carry bits.

Should the SEC receive a command that has an incorrect checksum, it will ignore the command and send a NAK message back to the host machine.

Fingerprinting

Each SEC unit will be assigned a unique ‘fingerprint’ as a security code that allows each SEC to be identified.

The SEC fingerprint is a 32bit binary number, allowing an unlimited number of individual fingerprints.

The fingerprint can be read at any time by the host machine to determine if a SEC has been changed in the machine, allowing for frauds to be detected.

Currently, the fingerprint is assigned during production test using a combination of software and special hardware. When the fingerprint is set, it cannot be modified or resetted. The unique SEC fingerprint is recorded at manufacture and used for quality control, parts tracking as well as security.

 

 

Features

  • Replaces up to 31 mechanical meters with individual counters stored in EEPROM
  • 7 Digit Liquid Chrystal Display for displaying contents of counters
  • Text messages and counter selection controlled by host machine
  • Clock Serial interface designed to work on existing meter ports
  • Tamperproof counters with unique fingerprint code
  • Secure software protocol

Technical Specifications

Hardware
  • Maximum Supply Voltage 36v
  • Minimum Supply Voltage 8.5v
  • Quiescent Current 21mA
Reset, Data In & Clock Inputs
  • Maximum Low Level Input 3v
  • Maximum High Level Input 20v
  • Inputs are pulled high internally 5v
  • Inputs can be driven directly via open collector drivers
Data Output
  • Maximum Output Current 100mA
  • Maximum Output Voltage 60v
Read/Write Clock Speed
  • Maximum 5KHz
  • Minimum 100Hz

 

Part Numbers

Part Number Region Description
27-0801 WW - Worldwide SEC Counter

Resources

Starpoint Electronic Counter - Drawing

English
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