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CRC errors
A counter that increments each time a message is received that has a CRC that does not match what is
calculated. Typically the result of wiring issues. Messages with CRC errors are discarded and not replied to.
Invalid frames
A counter that increments each time a malformed Modbus frame is detected. Malformed frames are for
example messages larger than the allowed maximum PDU size defined in the Modbus standards. This
can be caused by non-Modbus traffic on the network.
Rx time-outs (Modbus serial line)
A counter that increments each time an inter-character time-out occurred during the reception of an inbound
message.
Rx time-outs (Modbus/TCP)
A counter that increments if the master connection has timed out. Subsequently the connection is
terminated by the SL-MOD-GW. A time-out occurs if no Modbus request is received from a connected
client within a 10 second period.
Tx time-outs
Number time-outs occurred when attempting to send a reply message.
The cumulative diagnostic data is reset when the device is power cycled or reset. The data is also reset by
pressing the Clear Counter button.
5.2.3 Finding the firmware version and serial number
Click on the About menu entry on the menu bar to show the product information as shown below:
Illustration 5.4: About page
This product information is important for service and support inquiries. The following product information is
provided:
Product name
The name of the product.
Hardware version
SL-MOD-GW hardware version.
Firmware version
The firmware version that is installed on the SL-MOD-GW.
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UMSLMODGW-1006
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