10 TROUBLESHOOTING
10.3.12 Troubleshooting when data that cannot be decoded is transmitted and received
Symptom |
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| Corrective action |
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| • With a multidrop link, | • | Connect the external devices and the Q series |
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| two or more devices |
| C24 in a 1:1 configuration and perform a |
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| transmitted data at the |
| communications test. |
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| same time. |
| Since data is transmitted simultaneously from |
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| two or more devices with a multidrop link when |
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| normal data communications among all the |
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| devices is possible, interlock the external devices |
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| so that they do not transmit simultaneously. |
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| • Data does not match the | • Match the Q series C24 and external device |
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| parity bit setting. |
| parity bit settings. |
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| Note |
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| • If the setting of one side is data bit length 7 |
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| bits and with parity and the setting of the |
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| • Data does not match the |
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| other side is data length 8 bits and without |
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| parity bit setting. |
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| parity, the number of transmission/receive |
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• Data that cannot be |
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| bits will be the same and the data will sent |
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decoded was |
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| and receive without generating an error. |
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transmitted and |
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• Transmission rate | • | Match the Q series C24 and external device |
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received |
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| settings do not match. |
| transmission rates. |
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| • | With a multidrop link, the | • | Check if the terminal resistor (110 | or 330 |
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| terminal resistor is not |
| in case of the Q series C24) is connected to the |
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| connected correctly. |
| stations at both ends of the link. |
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| • When CH1 and CH2 are | • When using CH1 and CH2 independently, |
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| used to the linked mode, |
| check that the Q series C24 is not in the linked |
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| there is an interface |
| mode. |
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| without cable | • When using CH1 and CH2 in the linked mode, |
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| connection. |
| also connect the cable to both of the interfaces. |
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| Note |
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| • If the cable is not connected to one of the |
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| interfaces when CH1 and CH2 are used in |
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| the linked mode, noise may enter and destroy |
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| the data and "Data cannot be decoded" or |
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| "Communication error cause" may occur. |
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Bidirectional Non procedure
10 - 39 | 10 - 39 |