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Ver.1.1
⑧ ACK packet generation
It is time for ACK packet generation. It takes 1.0 ms
⑨ ACK packet transmission
It is time for ACK packet transmission that the acknowledgement of data packet reception. It takes 0.45
ms.
⑩ ACK reception processing
It is processing time for ACK packet. It takes 1.0ms.
⑪ Serial output of received packet
It is time for output of received data packet to the host 2 through the serial port. The time period depends
on the communication setting between the host 2 and the receiver FDP02.
If the transmission is text data at the packet transmission mode, size of output data packet is message bytes
+ 8 bytes because the header is 6 bytes and delimiter is 2 bytes. If the transmission is binary data at the
packet transmission mode, size of send data packet is message bytes + 11 bytes because the header is 9
bytes and delimiter is 2 bytes.
At the headerless packet mode, the data size is message bytes + 2 bytes if delimiter is included. On the
other hand, if the trigger of transmission is "time-out", the data size is the same as the message size. If
"Adding '<Cr><Lf>' to received data" function of the receiver FDP02 is turned on by the bit 4 of REG23
(setting value is 1) at the headerless transmission mode, "<Cr><Lf>" is added at the end of the data and it
consume 2 bytes.
⑫ Indication of data transmit completion
A response is returned to the host 1when the data transmission is completed correctly. The length of
response data is 4 bytes, and the time period of response return depends on the parameter settings of the
communication parameters that are described in above section ①.
Based on the above data processing flow, the total time for the data packet transmission from the host 1 to the
host 2 can be calculated like below. (In the below calculation, no data packet re-transmission is supposed.)
Bit length per byte
Line speed
of
the sender
Bit length per byte
+
Line speed
A: Text data is transmitted at packet transmission mode:
Binary data is transmitted at packet transmission mode:
Trigger of the data transmission is delimiter at headerless packet transmission mode:
Trigger of the data transmission is time-out at headerless packet transmission mode: 0
B: Trigger of the data transmission is time-out at headerless packet transmission mode:
Others:
C: Data size of message is 0 to 26 bytes:
Data size of message is 27 to 52 bytes:
Data size of message is 53 to 78 bytes:
Data size of message is 79 to 104 bytes:
Data size of message is 105 to 103 bytes:
D: Text data is transmitted in packet transmission mode:
Binary data is transmitted in packet transmission mode:
Trigger of the data transmission is delimiter at headerless packet transmission mode:
× 1000 × (size of message in bytes + A) + B + 6.4 × (C – 1)
× 1000 × (size of message in bytes + D) + 4.0 [ms]
of
the receiver
8
Expression 1
9
12
2
"Value of REG26" x 10
0
1 (*)
2
3
4
5
8
11
2
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