Panasonic FP2 User Manual

FP2 Serial Data UnitTransmission Speed and Transmission Format
viii
Start bit and Stop bit
With normal communication, it is rare for a data transmission to consist of a single data
element (character). Usually, characters of a certain unit are sent in succession. With
serial communication, one “0” bit is always inserted before each data element, to
separate the various data elements being transmitted, and a “1” is added at the end of
each data element, for the same purpose. The “0” inserted before the data is called a
“start bit” and the “1” added at the end of the data is called a “stop bit”.
1
Start bit “0”
0100010
One data element (character)
01
Stop bit “1”
1
Start bit “0”
0100010
One data element (character)
011
Start bit “0”
0100010
One data element (character)
01
Stop bit “1” Stop bit “1”
With the serial data unit, the start bits and stop bits are inserted automatically.
Stop bit length
With serial communication, one bit is normally used for the stop bit, but if there is a lot
of noise on the communication circuit, or if the transmission speed fluctuates sharply,
two bits can be used as the stop bit, to differentiate one data element from the next more
clearly.
1
Start bit
0100010
One data element (character)
01
Stop bit
When the stop bit is 1 bit
1
Start bit
0100010
One data element (character)
011
Stop bit
(when 2 bits
are used)
When the stop bit is 2 bits
With the serial data unit, either “1 bit” or “2 bits” may be selected as the stop bit length.

Panasonic FP2 Specifications

General

Brand	Panasonic
Model	FP2
Category	Controller
Language	English