7 DATA COMMUNICATIONS USING BIDIRECTIONAL PROTOCOL
7.1.4 How to detect reception errors
This section explains how to detect errors that may occur when receiving data from the external device.
The following items are considered as the primary causes of errors that may occur during data reception.
Cause of reception error | Reference section |
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A transmission error occurred because of noise. | — |
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A timeout occurred for the | User's Manual |
| Section 6.1 | |
A timeout occurred for the transmission monitoring time (timer 2) |
| Section 6.2 | ||
| (Application) |
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Data that could not be converted with the |
| Chapter 13 | ||
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Received the data length that was too long to store in the receiving area. | Section 7.1.2 | |||
Simultaneous transmissions occurred. | Section 7.3 | |||
(1)Confirmation using the sequence program
(a)Detecting the occurrence of a reception error
1)The single (XE/XF) is on when the ERR LED is on.
2)The receive error code is confirmed and read in the buffer memory data reception result storage area (address: 258H/268H).
For details on how to check the error code contents and corrective actions, see Chapter 10.
(b)How to turn off the ERR LED and clear the error code (see Section 10.1.2)
1)To turn off only the ERR LED, write a "1" to the LED OFF request area (addresses 0H/1H) in the buffer memory.
2)To turn off the ERR LED and clear the error code, turn ON the ERR LED OFF request output signal (YE/YF).
(Example) To perform the ERR LED OFF and the error code clear on the CH1 side
Read command
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