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CHAPTER 1 ABOUT COMMUNICATIONS METHODS
1-2
1.1 Outline
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JCommunicationsspecifications
Transmission line connection Multiple point
Communications method
RSĆ485 (2Ćwire, halfĆduplex)
Synchronization method
StartĆstop synchronization
Baud rate
*1
1200, 2400, 4800,
9600
(bit /s)
Communication code
ASCII
Data bits
*1
7
or 8 bits
Stop bits
*1
1 or
2
bits
Error detection
Vertical parity (non,
even
, or odd)
BCC (block check character)
Flow control
None
Interface
RSĆ485
Retry function
None
Communications buffer
40 byte
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JIntroduction