IBM manual IBM System x3500 Type 7977 Installation Guide

Serial 2 (COM 2) connector: Connect a 9-pin serial device to this connector. This connector can also be redirected in the Configuration/Setup Utility program for use with the baseboard management controller (BMC) or Remote Supervisor Adapter II SlimLine to control the server remotely. Do not connect any 9-pin serial devices to this connector when it is configured for use with the BMC or Remote Supervisor Adapter II SlimLine.

Note: When this connector is configured for use with the system management, do not connect any other 9-pin serial devices to this connector.

38IBM System x3500 Type 7977: Installation Guide