1.1 RS-232C Specifications
3
When using hardware (RTS/CTS control):
• When the data in the receive buffer exceeds 85% of
the buffer, CA(RTS) is set to OFF
and the controller is
notified that there is not much space remaining in the
buffer.
• Processing of the data in the buffer continues, and
then CA(RTS) is set to ON
and the controller is noti-
fied that there is sufficient remaining space in the buf-
fer when the amount of data becomes less than 25%
.
When using software (XON/XOFF control):
• When the data in the receive buffer exceeds 75% of
the buffer, XOFF(13H) is sent
and the controller is notified that there is not much space remaining in
the buffer.
• Processing of the data in the buffer continues, and then XON(11H) is sent and the controller is notified
that there is sufficient remaining space in the buffer when the amount of data becomes less than 25%
.
When using hardware (RTS/CTS control):
• When CB(CTS) is confirmed to be OFF, the sending of data is halted. When it is confirmed to be ON,
the sending of data is resumed.
When using software (XON/XOFF control):
• When XOFF is received, the sending of data is halted. When XON is received, the sending of data is
resumed.
Specifications Chapter 1
1.1 RS-232C Specifications
Transmission Method
Communication method: Full duplex
Synchronous method: Start-stop synchronization
Transmission Speed 9600 bps, 19200 bps, 38400 bps, 57600 bps
Data Bits 8 bits
Parity None
Stop bit 1 bits
Message terminator
(delimiter)
CR+LF, CR
Flow control
Hardware (RTS/CTS control), software (XON/XOFF control)
“Handshake (About Buffer Flow Control)” (p. 3)
IM7580: Software (XON/XOFF control only)
Electrical
Specifications
Input voltage
level
Output voltage
level
5 to 15 V ........ ON
-15 to -5 V ....... OFF
5 to 9 V .......... ON
-9 to -5 V ........ OFF
Handshake (About Buffer Flow Control)
CA(RTS)
OFF
ON
25%
85%
Input Buffer
Usage
Amount
Buffer Space
75%
Send XOFF
Send XON
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