On the preparation for the CANbus commissioning

1
On the preparation for the CANbus commissioning

• Outline
• CANbus cabling
• What to do.
• What we need.
• ADC-I CANbus communications
• What to do
• What we need.
• Status

2
CANbus cabling What to do.

• Check Continuity
• CAN data lines
• Measure impedance
• 60? ? OK
• 120? ? Cable broken in one place
• High Z ? Cable broken in at least two places
• CAN power lines and Shield
• Short lines check continuity using a digital
  multimeter
• Long lines Put known voltage in one side of the
  cable and measure the voltage in the other side.
• Check that the shield is connected to earth in
  both sides of the cable

3
CANbus cabling What we need

• Power Supply Adjustable from 15 to 20V. Output
  current limit around 2A.
• Digital multimeter, Amperimeter, and a box with
  tools.
• 1 board that allows to connect the Power Supply
  to the CANbus Power lines.
• 1 board to have access to all the lines of the
  CANbus cable, using an Oscilloscope and a Digital
  multimeter.

4
Board to connect the Power supply to the CANbus

• Input Connector DB9 female
• Output Connector DB9 male
• Power Connector 2 pins to conect the Power
  supply cables

5
Board to have access to all the CANbus lines
6
ADC-I CANbus communications What to do.

• Once we have checked the cabling
• Try to communicate with each one of the 16 ADCs
  that there are in one CAN branch.
• If someone fails
• Check the input voltages of the drawer, to see if
  the drawer is powered properly.
• Observe the traffic of the CANbus data line with
  an Oscilloscope, to see if the ADC is replying
  and to check the signal integrity.
• Run the QC program, using a laptop with a
  PCMCIA-CAN2 card.
• If QC fails ? The ADC-I must be replaced.

7
ADC-I CANbus communications What we need.

• The same that we need to check the cabling
• Power supply, Digital multimeter, Amperimeter,
  tools.
• 1 board to connect the power supply to the
  CANbus.
• 1 board to have access to all the lines of the
  CANbus
• 1 oscilloscope
• Laptop with National instruments PCMCIA-CAN2 card
• VME crate with 1 ROB
• Cable Belden 9844 for dual CAN lines.

8
Status of the Components

• Power Supply.
• We can use a power supply from IFAE or try to get
  a power supply from CERN.
• Oscilloscope There is one at CERN.
• Cable Belden 9844 for dual CAN lines.
• We can get this cable at CERN.
• VME crate.
• We can use a VME crate from IFAE or try to get
  one at CERN.
• All the rest of the things that we need are
  ready.