Communication manual TOHO ELECTRONICS INC.
DWG.No. 4B-6829-A
- 10 -
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Things to Be Noted during the Communication
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Timing of Transmission
Upon using the communication function, set enough response delay time to ensure the communication (sending/receiving) with the
host computer.
See “
Setting of Response Delay Time
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Request Interval
If “request message” is to be sent continuously by the upper computer, wait for at least 2msecs from the arrival of the “resp
onse
message” from this product before sending the
next request message.
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Conditions for Response
This product will not return the “response message” if STX and ETX (BCC) are not included in the “request message.”
Therefore, although there is an error in the “request message,”“response message” with NAK an
d error code will not be returned unless
the above condition is met.
Therefore, the upper computer should resend the necessary “request message” if the “response message” is not returned within
areasonable time.
Once STX is received, this product clears all codes that were received prior to the said STX.
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Address Specification Error
This product will not respond to any “request message” that specifies the address that is other than the one that has been se
t to itself.
Therefore, if there is an error in the
address section of the “request message,” none of the slave stations will return the “response
message.”
Therefore, the upper computer should resend the necessary “request message” if the “response message” is not returned within
areasonable time.
Once STX is received, this product clears all codes that were received prior to the said STX.
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Number of Digits of Data and Position of Decimal Point
See “4.4. Explanation About Codes ⑥ Numerical Data.”
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Operation after Receiving a Save Request Message
This product starts the saving of data once it receives the save request message correctly from the upper computer.
Only the data that is different from the one stored in EEPROM (changed data) shall be saved. Data will be saved within 6 seconds.
This product will send the response (ACK) when the save request message is received. Some data may be lost if the product is turned OFF
while the saving process is in progress. Do not turn the power of this product OFF for at least 6 seconds after sending a save request
message.
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Saving Data Other than Save Request Message
This product saves the parameter into EEPROM even without receiving the save request message in this case:
・
If the parameter is changed through key operation, it writes only changed parameter and other related parameters.
