This document discusses flow control for CAN-TP and UDS protocols. It explains that flow control frames use PCI bytes to specify the count of frames (block size, BS) that may be sent before waiting for the next flow control frame and the minimum delay time between frames (separation time, ST MIN). An example shows a block size of 4 frames with a minimum separation time of 2 milliseconds between frames.

1. CAN-TP
UDS
FLOW CONTROL
Protocol
Control
Information
PCI BYTES

2. FRAMES
https://en.wikipedia.org/wiki/ISO_15765-2

3. FRAMES

4. FLOW CONTROL : 30 00 00
https://en.wikipedia.org/wiki/ISO_15765-2

5. BLOCK SIZE
The count of frames that may be sent
before waiting for the next flow
control frame. A value of zero allows
the remaining frames to be sent
without flow control or delay.

6. ST MIN
Separation Time (ST), the minimum delay time between
frames. ST values up to 127 (0x7F) specify the minimum
number of milliseconds to delay between frames, while
values in the range 241 (0xF1) to 249 (0xF9) specify
delays increasing from 100 to 900 microseconds. Note
that the Separation Time is defined as the minimum
time between the end of one frame to the beginning of
the next.

7. BS = 0, STMIN = 0

8. EXAMPLE:
BS = 4
ST MIN = 2 (2MS)

9. EXAMPLE

10. EXAMPLE

11. EXAMPLE