User's Manual

Ver.1.0
9
① Serial input of transmission data packet
The time required to data input between the host1 and the sender FDP03 is defined by below
communication parameter.
- Line speed (9,600 to 115,200 bps)
- Data bit length (7 or 8 bits)
- Parity bit (odd, even, or no parity)
- Stop bit length (1 or 2 bits)
- Start bit length (always 1 bit)
For example, data transmission time is 87us when the line speed is 115,200bps, the data bit length is 8 bits,
the parity bit is NONE, the stop bit length is 1 and the start bit length is 1. (Time of data transmission for
1 bit is 8.7us and 1byte is 10bits.)
If the transmission is text data at the packet transmission mode, size of send data packet is message bytes +
9 bytes because the header is 7 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 + 12 bytes because the header is 10 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.
However, the data transmission time is defined by “time-out” setting by REG24 and REG26 register.
② Command processing
It is the time for internal processing to
of receiving and decoding the packet that comes from the serial port.
It takes 1.5 ms.
③ Transmission packet generation
It is the time for transmission data packet generation. It takes 1.0 ms.
④ Response of input data format acceptance
It is the time for response when the receiving data format is valid. The length is 4 bytes. It depends on
the parameters of ①.
⑤ Carrier sensing
It is the time for detection whether other radio station uses same frequency band. If other radio station
uses the frequency band, the sender FDP03 does not transmits the data. It takes 0.1 ms.
If the wireless environment is very severe, noise level is very high and/or other
wireless systems occupy the area, the sender FDP03 may be not able to transmit
any data because of carrier sensing.
⑥ Message transmission
It is the time for data transmission and it takes 0.45 ms.
⑦ Data reception processing
It is the time for the receiving data processing and it takes 2.4 ms.