HP t628 t628 Thin Client - Page 23

Configuring serial ports Two configurable serial ports, COM 2 and COM 4, are standard on the thin client. On some models, COM 3 is also a configurable serial port. COM 1 is a standard serial port that cannot be configured. Some devices use a powered serial port. If the serial port is configured as a powered port, devices that support a powered serial interface do not require an external power source. Locating configurable serial port jumpers See Locating internal components on page 11 to find the configurable serial port jumpers. Individual configurable serial port jumpers on the system board are positioned as shown in the following illustration: COM 2 Item Jumper 1 COM 2 CN20 2 COM 2 CN23 3 COM 2 CN22 4 COM 2 CN27 5 COM 2 CN21 6 COM 2 CN26 7 COM 2 CN 38 COM 4 Item Jumper 8 COM 4 CN31 9 COM 4 CN33 10 COM 4 CN30 11 COM 4 CN29 12 COM 4 CN25 13 COM 4 CN24 14 COM 4 CN28 COM 3 Item Jumper 15 COM 3 CN35 16 COM 3 CN34 17 COM 3 CN36 18 COM 3 CN37 NOTE: CN38 sets the signaling type that comes from the device attached, either RS-232 levels or TTL levels. If in doubt, leave the jumper in the RS-232 position until you are sure the attached device uses TTL level signaling. CN38 is used for the receive signal. Configuring serial ports 17