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SENDER RECEIVER
<--- <C>
times out after 3 seconds,
<--- <C>
times out after 3 seconds,
<--- <C>
times out after 3 seconds,
<--- <C>
times out after 3 seconds,
<--- <nak>
<soh> 01 FE -data- <xx> --->
<--- <ack>
<soh> 02 FD -data- <xx> ---> (data gets line hit)
<--- <nak>
<soh> 02 FD -data- <xx> --->
<--- <ack>
<soh> 03 FC -data- <xx> --->
(ack gets garbaged) <--- <ack>
times out after 10 seconds,
<--- <nak>
<soh> 03 FC -data- <xx> --->
<--- <ack>
<eot> --->
<--- <ack>
Here is a data flow example for the case where the receiver requests
transmission in the CRC mode and the sender supports the CRC option. This
example also includes various transmission errors. <xxxx> represents the
2 CRC bytes.
Chapter 8 Xmodem Protocol Overview
X/YMODEM Protocol Reference 10-27-87 26
Figure 13. Receiver and Sender Both have CRC Option
SENDER RECEIVER
<--- <C>
<soh> 01 FE -data- <xxxx> --->
<--- <ack>
<soh> 02 FD -data- <xxxx> ---> (data gets line hit)
<--- <nak>
<soh> 02 FD -data- <xxxx> --->
<--- <ack>
<soh> 03 FC -data- <xxxx> --->
(ack gets garbaged) <--- <ack>
times out after 10 seconds,
<--- <nak>
<soh> 03 FC -data- <xxxx> --->
<--- <ack>
<eot> --->
<--- <ack>