Nonvolatile Ram Functionality; Can-Bus - Atlas Copco Air Contact Hardware Manual

Gsm-gprs modem

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4.3.2

Push button

The module has 1 push button. It is mechanically protected from accidental pushing. It is used to reset the

service hours counter.

4.3.3

Leds

Three LEDs are mounted on the PCB, visible to the operator through dedicated holes in the front panel

and have the function to indicate machine status. One LED is controlled by microcontroller, one LED is

directly controlled by modem AT interface and one LED is used to indicate power on.

4.3.4

Switches

One rotary selector switch with 10 positions is provided in the design to adjust the service time hours.

The switch is accessible from outside and can be turned with a screw driver. Service Time hours from

1000 up to 9000 are possible. The switch is used to select the thousands of hours.

4.3.5

Sim Card Holder

A SIM card holder is provided in the design to insert and change the SIM card. The SIM card holder is

accessible from outside the front panel under a plastic cap removable by service personnel.

4.3.6

Lexan adhesive front foil

A coulored custom specific adhesive front foil in Lexan material is provided on the front panel to show

connectors code and labels indication.

4.4 Nonvolatile RAM functionality

Like the Main MkIV Controllers the Air Contact GSM module has an Nonvolatile RAM feature to save data

before a power off occurs. The concept behind is the same. If the power supply falls below the specified

minimum voltage an interrupt occurs. From now on the CPU saves the specific data in the Flash EPROM.

The C164CI has an integrated On-Chip CAN unit according the CAN specification V2.0 part B. This

module handles the completely autonomous transmission and reception of CAN telegrams. That means,

once the transmit buffer has written or the receive buffer is empty no CPU time is required. The CAN unit

can receive and transmit standard frames with 11-bit identifier as well as extended frames with 29-bit

identifier. Which kind of configuration will be used depends on the software protocol. The baudrate is

programmable in a wide range, but only standards will be implemented.

Switches:

One 8 dip switch selector is provided in the design to set the CAN-Bus node number.

The switches are accessible from outside. Node numbers from 1 up to 31 are possible.

Air Contact Hardware Manual

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