147
Specifications
11.2 Specifications
RS‑232C
Transmission method
Communications method: Full duplex
Sync method: Asynchronous transmission system
Transmission speed
9600 bps, 19200 bps, 38400 bps, 57600 bps
Data length
8 bits
Parity
None
Stop bit
1 bit
Message terminators
(delimiters)
CR+LF, CR
Flow control
Software (XON/XOFF control)
See “Handshaking (Buffer Flow Control)” below.
Electrical specifications
Input voltage level
5 V to 15 V: ON, −15 V to −5 V: OFF
Output voltage level
5 V to 9 V: ON, −9 V to −5 V: OFF
Handshaking (Buffer Flow Control)
Control during reception
XON/XOFF control
Input buf
fer use amount
85%
75%
25%
Buffer empty
Sending XON
Sending XOFF
• If the data in the reception buffer exceeds 75%
of the buffer, XOFF (13H) is sent to notify the
controller that there is little space remaining in the
buffer.
• If data processing in the buffer is proceeding and
the data amount is less than 25%, XON (11H) is
sent to notify the controller that there is sufficient
space in the buffer.
Control during transmission
XON/XOFF control
• When XOFF is received, data transmission stops. When XON is received, data transmission
starts.
IMPORTANT
In a noisy environment, there is a risk of data mismatch during RS-232C communications. If using RS-232C
communications in a location with a poor noise environment, acquire the data multiple times to check its
conformance.
11
Communications Interface
Содержание ST4030
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Страница 132: ...124 Terminal Open Error Setting ...
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Страница 237: ...229 Dimensions Diagram 15 4 Dimensions Diagram Unit mm 215 1 348 3 178 0 5 285 6 0 5 200 1 13 40 3 1 15 3 1 15 Appendix ...
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