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Bard part number 8301-029 is an OEM null modem communication cable used to connect service or control hardware when a direct serial link is required, converting between a 25 pin male connector and a 9 pin male connector for proper device to device communication. This cable is commonly used during setup, troubleshooting, or commissioning tasks where dependable serial communications are needed to read or adjust compatible Bard controls. For best results, confirm your unit controller and the service tool you are using require a null modem configuration and verify the connector style and pin count before ordering to ensure a correct fit and reliable connection.