IBM x3500 - System - 7977 Installation Manual page 52

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.
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IBM System x3500 Type 7977: Installation Guide