Beijer Electronics SCOM RBC EN User Manual
Page 11
Protocol Description and Timings
Beijer Electronics, MAEN993
11
The Lr value depends on the command, for which the response message is generated.
Detailed information and the “Maximum Lr value” for each response message can be
found in Command Reference chapter.
Example
Broadcast command response for command BRT, sent by device with address 7 at
9600 baud: Te = (2.5 + 9) x 10 x 8 / 9600
≈ 0.0958 s = 95.8 ms
The delay time Te is inserted by the device automatically, only if the RS485 interface
is selected for the communication. If the RS232 or USB interface is used, the re-
sponse message is generated and sent as fast as possible.
The RS232 communication does not require a delay time due to the point-to-point
communication, where only two devices can be attached to the line (i.e. host and
Beijer Electronics RBC or Beijer Electronics RBC and Beijer Electronics RBC). USB
communication is similar to the RS485 communication, where many devices can be
attached to the same line. However, in contrast to the RS485 interface, a collision is
handled by the USB architecture and software, so there is no need for anti-collision
support within the device.
Note:
The given “Maximum Lr value” is specified for a valid command. If an invalid command
with a data field exceeding the specification is sent, the Lr value will grow accordingly.
Related information