HRX-OM-Y120
Chapter 3 Serial communication
3.5
Precautions for communication
HRL Series
3-4
3.5 Precautions for communication
3.5.1 Precautions after wiring and before communication
○
Check or set the each communication setting by the touch panel.
・
The communication specification shall be the customer’s
communication standard.
・
The operation mode shall be the SERIAL mode.
(When mode
request flagis activated, SERIAL mode is selected. Refer to 3.13.9).
Other modes can perform reading, but only SERIAL mode can perform
writing.
○
Check or set the communication parameters using the touch panel.
Check or set the communication speed so that the product ynchronizes
with the host computer (master) prepared by the customer.
○
Check the slave address by the touch panel.
No response is returned when a request message is sent from a slave
address other than those set in the product.
3.5.2 Precautions for communicating
○
Allow a suitable interval between requests.
To send request messages in series, wait for 100 msec. or longer after
receiving a response message from the product before sending the
next message.
○
Retry (resend request message)
.
The response may not be returned due to noise. If no message is
returned 1sec. after sending a request message, resend the request
message.
○
If necessary send a read request message to check if it was written
correctly.
Message to notify the completion of the process is returned when the
action for the written request message is completed.
Send a read request message to confirm if the setting was written as
requested.
○
Setting limit of circulating fluid temperature
When the circulating fluid set temperature is written by communication,
the data is stored in FRAM. When the product restarts, it restarts with
the value which was set before the restart. The number of times it is
possible to overwrite FRAM is limited. Data is only stored in FRAM
when it receives a circulating fluid set temperature which is different
from the previous temperatures. Please check how many times it is
possible to overwrite FRAM, and avoid unnecessary changes of the
circulating fluid set temperature during communication
