GridConnect CAN USB-232, Руководство пользователя

Страница: 28 / 65

Troubleshooting
2-20 CAN USB-232 User Manual
2.5.2 Set Com Port
Configuration of the COM port is simple and consists of specifying the serial baudrate, parity, the number of
data bits, stop bits, Hardware flow control. The response will echo the selected settings and the baud rate
tolerance percent.
2.6 CAN Port Options
2.6.1 Defining the CAN Bit-Time
In order for a CAN network to correctly arbitrate multiple senders and to adapt to variances in system
clocks, the low-level bit must be correctly specified for the specific characteristics of the network. The CAN
USB-232 provides a means of configuring these parameters so as to support a wide array of network
scenarios.
Note that the CAN bit rate settings can be specified as a bit-rate, sampling point, and tolerance. The code
will find the best fit solution.
2.6.2 CAN Bus State During Configuration
While the CAN USB-232 is in the configuration mode, the CAN controller is in the bus-off state. It does not
interact with the bus and is effectively ‘invisible’. Thus, it is possible to perform configuration of the CAN
USB-232 while still connected to an active CAN network and not adversely affect network operation.
Once the configuration state is exited, the CAN USB-232 will activate the CAN controller and begin
immediately interacting with the CAN network according to the CAN 2.0A/B specification.
It is the users responsibility to ensure that the configuration settings are appropriate for the network to which
the CAN USB-232 is connected so that the CAN USB-232 operates correctly and does not cause erratic
network operation.