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915U-2 Wireless I/O
5.1.1 Modbus Error Registers
Each of the Expansion I/O modules have diagnostics registers that can indicate any
Modbus Errors, Codes, Counts, etc.
30017 + Offset = Modbus Error Counter (number of errors the modules has had)
30018 + Offset = Modbus Last Error Code (see Appendix D for codes)
30019 + Offset = Modbus Lost Link Counter (number of Communication Errors)
30020 + Offset = Modbus Module Type
dec 257 (101hex) indicates a 115S-11
dec 513 (201hex) indicates a 115S-12
dec 769 (301hex) indicates a 115S-13
5.2 Connectivity
The Connectivity webpage displays connections and available networks. The
"Connected Devices" section displays the radio channel, received signal strength, and
radio data rate for each Client or Access Point by their MAC Address. The readings
shown are based upon the last received data message from the Access Point or Client.
Client stations also display a list of detected Access points (Site Survey), including
network name (SSID), channel and maximum data rate.
Note that when updating the Connectivity webpage, it is necessary to hold down the
<ctrl> key while pressing the refresh button. Otherwise, the information will not be
updated.
Dest
Destination IP Address
Next
Next IP Address
Hops
Number of Hops
RSSI (Radio Signal Strength Indication) measured in dBm which is a
negative value scaled from -30dBm (good) to -120dBm (bad). RSSI is
RSSI
displayed for destination addresses, which are direct neighbours. If the
Destination IP is not the next hop, you will see an RSSI value of "~"
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Figure 34 - Connectivity
Description
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915U-2 Wireless I/O
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