Sun Microsystems 60 service manual Serial Port Jumpers, Table C-16Serial Port Jumper Settings

C.4.1 Serial Port Jumpers

Serial port jumpers J2604 and J2605 can be set to either RS-423 or RS-232 serial interface. The jumpers are preset for RS-423. RS-232 is required for digital telecommunication within the European Community. TABLE C-16identifies serial port jumper settings. If the system is being connected to a public X.25 network, the serial port mode jumper setting may need to change from RS-423 to RS-232 mode.

To change the serial port mode jumper setting:

1.Power off the system unit.

See Section 6.2, “Powering Off the System Unit” on page 6-3.

2.Remove the side access cover.

See Section 7.1, “Removing the Side Access Cover” on page 7-2.

Caution –Use proper ESD grounding techniques when handling components. Wear an antistatic wriststrap and use an ESD-protected mat. Store ESD-sensitive components in antistatic bags before placing them on any surface.

3.Attach the wrist strap.

See Section 7.2, “Attaching the Wrist Strap” on page 7-3.

4.Locate the jumpers on the system board. Change the J2604 and J2605 jumper selection.

See TABLE C-16.

5.Detach the wrist strap.

6.Replace the side access cover.

See Section 7.3, “Replacing the Side Access Cover” on page 7-4.

7.Power on the system unit.

See Section 6.1, “Powering On the System Unit” on page 6-2.

TABLE C-16Serial Port Jumper Settings

			Default Jumper
Jumper	Pins 1 + 2 Select	Pins 2 + 3 Select	on Pins
J2604	RS-232	RS-423	2 + 3
J2605	RS-232	RS-423	2 + 3

C-46Sun Ultra 60 Service Manual • August 2001