Troubleshooting
Serial Communication Troubleshooting
This section is used to troubleshoot the communication between two devices linked via serial ports, i.e. RS232 or RS485.
TIP: For communication troubleshooting, it is strongly advised to create a new Graco Gateway database including only one data tag mapped to a known register in the target device.
PROBLEM | CAUSE | SOLUTION |
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Values show | Port settings do not match. | Check that the port settings of the |
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| Graco Gateway device match the tar- |
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| get device (i.e. Baud, Parity, etc.). |
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| Incorrect target device address. | Check that the target device address |
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| in Graco Gateway (in communica- |
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| tions on the PLC symbol) matches |
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| the target device address setup. |
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| Incorrect cable. | Check the cable part number or |
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| cabling to match your protocol. |
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| Incorrect communication port. | Check if the cable is connected to the |
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| correct communication port. |
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| If the above is correct, check that the |
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| protocol settings are on the correct |
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| communication port in Graco Gate- |
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| way. |
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| Communication port connector pins | Although unlikely, check the commu- |
| bent inward. | nication port connector pins on the |
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| Graco Gateway in case some are |
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| bent inward resulting in a bad contact |
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| with the cable. |
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| Incorrect tag mapping. | Check that the tag is mapped to an |
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| existing register in the target device. |
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Values blink between the data and | Incorrect tag mapping on one of the | Delete tags one after another and |
tags on the display. | download | |
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| ues on the screen stop blinking, the |
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| last deleted tag was mapped incor- |
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| rectly or accessed an unknown regis- |
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| ter in the target device. |
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| Communications | Increase the Slave Response or |
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| Device Timeout on the communica- |
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| tion port or target device in Graco |
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| Gateway. |
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36 | 312785C |
