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Communications
Communications Method
Set RS232C communications baud rate with Pr0C. Any change to these parameters will be valid when you
power on the control power supply. For detailed information, refer to list of parameters related to the following
communications:
RS232C
Full-duplex, asynchronous communication method
2400, 4800, 9600bps
8 bit
No
1 bit
1 bit
Communications baud rate
Data
Parity
Start bit
Stop bit
Time for data transmission is calculated with the following expression, for instance, in the case of 9600 [bps]:
When the baud rates of 2400 bps and 4800 [bps] are used, data transmission time will be 4.17 [ms/byte] and
2.08 [ms/byte], respectively. Note, however, actual communication time will be added time necessary for
processing received command, and necessary for switching between a line and transmission/reception control.
List of User Parameters Related to Communications
PrNo.
00
0C
Shaft name
Setting of baud rate for
RS232C communications
Set the communications speed of RS232C communications.
0 : 2400[bps] 1 : 4800[bps] 2 : 9600[bps]
A change will be valid when you power on the control power supply.
Parameter Name
Range of Setting
1 - 15
0 - 2
Functional Description
Refer to descriptions on parameters on pages 88 and 116.
Handshaking Code
For line control, the following codes are used.
ENQ …When the module has a block to transmit, it sends ENQ.
EOT … When the module is ready to receive a block, it sends EOT. The line enters transmission mode when
sending ENQ and receiving EOT. It enters reception mode when receiving ENQ and sending EOT.
ACK … When a received block is judged normal, ACK is returned.
NAK … When a received block is judged as abnormal, NAK is returned. A judgment is made based on
checksum and timeout.
Code
05h
04h
06h
15h
Name
ENQ
EOT
ACK
NAK
Functions
Transmission request
Ready for receiving
Acknowledgement
Negative acknowledgement
(1000/9600) x (1 + 8 + 1) = 1.04 [ms/byte]
Start bit
Stop bit
Data