https://www.lairdtech.com/products/cl4490-series

Support 800-492-2320 ext 3

Power supply connector: OD 5.5mm/ID 2.8mm Adaptaplug "O" enercell 273-346

For device firmware update Configuration Utility should be the tool.

CTS/RTS recommended by support, DCD being required is a surprise.

http://rusefi.com/forum/viewtopic.php?f=4&t=1226&hilit=rs232#p25672

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Product: CL4490 automatically switch to AC4490 on "Read Radio"
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Configuration/Test Utility can "open" port without radio attached