When an RS232 device is connected to a Cisco IR829 router, the data collected is not being parsed correctly by the edge application. Which two steps should be taken to troubleshoot the issue?…

Question

Options

• ASSH access on the Cisco IR829 router must be enabled for IOx Guest OS.
• BCommunication mode must be set to half duplex over serial connection.
• CSerial cable length should not exceed 1.5 meters.
• DEnsure that communication parameters like baud rate and parity are set correctly.
• ESet the cable connections based on the PIN layout from the sensor vendor.

• A
  17% (3)
• B
  6% (1)
• C
  6% (1)
• D
  72% (13)

Explanation

When RS232 data isn't parsed correctly, the root cause almost always lies in physical wiring mismatches or misaligned serial communication parameters. Option D (baud rate, parity, data bits, stop bits) is correct because the edge application and the RS232 device must speak the same serial "language" - any mismatch causes garbled or unreadable data. Option E is correct because RS232 pinouts vary by vendor, and incorrect pin mapping (e.g., swapping TX/RX, or missing a required control line like RTS/CTS) means data never arrives in the first place or arrives corrupted.

The distractors fail for these reasons:

• A (SSH/IOx) - SSH access is an administrative concern unrelated to serial data parsing.
• B (half duplex) - RS232 is inherently full duplex; forcing half duplex would degrade performance and isn't a standard troubleshooting step.
• C (1.5m cable length) - RS232 supports cable runs up to ~15 meters; 1.5m is an arbitrary and overly restrictive limit not specified by the standard.

Memory tip: Think of RS232 troubleshooting as two layers - parameters (baud/parity/stop bits = D) and pins (physical wiring = E). If data isn't flowing or looks scrambled, always check "how fast and how wired" first.

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