Serial-device problems
Use this information to solve problems with serial ports or devices.
•  “Number of displayed serial ports is less than the number of installed serial ports” on page 404
•  “Serial device does not work” on page 405
Number of displayed serial ports is less than the number of installed serial ports
Complete the following steps until the problem is solved. 
1.  Make sure that: 
•  Each port is assigned a unique address in the Setup utility and none of the serial ports is disabled.
•  The serial-port adapter (if one is present) is seated correctly.
2.  Reseat the serial port adapter.
3.  Replace the serial port adapter.
404
ThinkSystem SR650 V2Maintenance Manual