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The Standby (Reset) pin is not locked down.
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The panel 12V backup battery is low or missing.
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Using the wrong product handler, for example, using 2112 instead of 2212.
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Too much Current Draw on panel. Disconnect devices from Aux Power and try again.
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Noise or interference on the keypad Data Bus. Disconnect all wires on the panel data terminals.
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Not enough free memory in the D5200 Programmer. There should be 60K free memory. Refer to KB article: How to Operate the D5200 Hand Held Programmer.
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The 2212 handler may be corrupted in the D5200. Delete the 2212 handler and re-download it. Refer to KB article: How to Operate the D5200 Hand Held Programmer.
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Low batteries in the D5200. Replace batteries using 4 C cells.
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Trying to program a panel that is not powered up
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The programming cord is not securely connected to the panel programming port or may be damaged. The DX4010V2 comes with a cord with a 4-pin Molex connector on one end and phone connector on other end. This cable may work as a substitute.