Table 9: BLE diagnostics
Parameter Description
BLE Tx Power The maximum Tx power in dBm that the CWCVT transmits data in
BLE mode.
MTU Size The negotiated transmit packet size to send data between two
BLE devices. 512 bytes is typical. Smaller numbers result in slower
transfers.
Tx Failures A running count of the number of Tx packet failures to the BLE
Host controller.
Pairing Failures A running count of the number of times a BLE Host controller
failed to pair with the CWCVT.
Note: The values in this table do not update automatically. The values are updated when the
table is first viewed and when the Refresh button at the bottom of the table is pressed. These
values reset to 0 on every power cycle or when the Reset BLE Diagnostics button is pressed.
Note: These values do not update when connected to the CWCVT in Wi-Fi AP Router mode.
MS/TP to SD Card Capture
About this task:
The CWCVT features a micro SD card slot that you can use to capture MS/TP bus traffic for
diagnostic purposes. The CWCVT supports 32 GB, FAT32 formatted micro SD cards. A unique .pcap
MS/TP capture file is created each time you enable or disable the MS/TP Capture feature. You can
view the capture files in Wireshark.
Note: MS/TP to SD Card Capture is an advanced feature. Ensure you are familiar with the MS/
TP protocol and how to use Wireshark, or send the capture files to someone who is.
To capture MS/TP bus traffic, complete the following steps:
1. Insert a FAT32 formatted micro SD card into the micro SD card slot of the CWCVT.
2. From the Diagnostics tab in the browser, scroll to the Log MS/TP to SD table, then select
Enabled and click Save.
Note: See Viewing settings and diagnostics from a browser for details about how to
access the CWCVT on a browser.
3. After the logging period ended, a problem on the MS/TP bus is detected, or a problem with
an MS/TP device on the bus is observed, change Log To SD card to Disabled and click Save.
Note: A single capture file is limited to 10 million frames, approximately 1 GB of SD
storage, or 24 hours of capture. The capture stops when the limit is reached.
4. Remove the micro SD card from the CWCVT and insert it into your PC. The capture file is
saved in a folder named mstp_captures. Up to 100 capture files are supported. Each
capture filename's name will be incremented, for example mstp_capture_x.pcap where x
is 1 to 100.
Note: The capture log is limited to valid frames and invalid packets are dropped.
5. Open the mstp_capture_x.pcap file in Wireshark to analyze the trace.
Note: The CWCVT does not feature a real-time clock, so the time stamps are relative
to the start of the capture. You can use Wireshark's Time Shift feature to set an
approximate time to when the capture was started.
CWCVT Wireless MS/TP Converter User Guide18
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