US Digital

Note: The T7 can drive 100 ft. of cable. Some PC's have limited drive on the RS232 bus which will limit the maximum cable length to less than 100 ft.

• Measurements taken at 25°C
• Damping time is a user programmable parameter
  

 Single Axis Orientation:

The T7 uses a FIR (Finite Impulse Response) digital filter to provide electronic damping of the angle readings. The digital filter's impulse response has a triangular weighting that decays linearly to zero. The damping time is user programmable from 2 milliseconds to 5000 milliseconds.  Since the sensor bandwidth is 8 Hz, damping times below 125 milliseconds do not provide any faster response. Increasing the damping time will average more samples together to form the reported angle. This will reduce noise in the output but increase the response time.

An inclinometer network assembled with the USD-CAN version or RS232 version of the T7 is shown below.

US Digital sells all the cables and connectors needed to wire a T7 network. The same cable and connectors can be used for both the USD-CAN or RS232 version since the T7 uses the same connector for both interface versions.

Regardless of the interface option, a host PC, PLC or microcontroller communicates with a network of T7s by sending/receiving simple serial port commands over the RS232 or RS485 bus. In the case of the USD-CAN version, the CAN adapter serves as a command translator between a standard RS232 or RS485 port and the USD-CAN bus used by the T7. The CAN adapter translates serial port command to the USD-CAN protocol and handles all network functions (access, error correction, etc.) to access the T7. Conversely, the CAN adapter also translates the reply from the T7 and sends the data to the host on the serial port. The CAN adapter frees the user from a complicated network interface on the host side. Note that the CAN adapter is not needed for the RS232 version of the T7. A host can communicate directly to a RS232 T7.

For more information on wiring T7 CAN networks see the CANA-232/CANA-485 Datasheet.

Each T7 on the network must be assigned a unique address from 1 to 100 or 127 (decimal). Address assignment is optional for the RS232 version. All T7s are shipped with a default address of 127. Address 126 is a special broadcast address - all T7s will listen and respond to commands sent to this address. To assign an address to a T7 unit, connect one T7 to a PC's serial port - either directly if using the RS232 version or through the CAN adapter for the CAN version. The address can be set using the the included PC based "T7 Demo" software . Alternately, a host computer can send the "Set Address" serial port command to the T7. This procedure only needs to be done once for each T7 since the address is stored in non-volatile flash memory.

All T7 units ship from US Digital with a default configuration.  All configuration parameters are stored in non-volatile flash memory and can be easily changed by the user. The specifications are shown below.  However, in larger quantities, special orders may be placed where the units can be preconfigured with any of the available settings noted in the CAN Adapter Host Serial Communication User Guide.  Please contact customer service for special orders.

Default Configuration:

• Address = 127
• Single-axis version uses Axis 2
• Angle output range set to +/-180 (-179.99 to 179.99) deg.
• Counting Direction set to "forward"
• Angle Offset set to 0
• Damping time = 1000 milliseconds