Table C-6 Serial Port Jumper Settings - Sun Microsystems Ultra 1 Creator Series Service Manual

J 2 X X X
*
*
*
FIGURE C-3
C.5.1 Serial Port Jumpers
Serial port jumpers J2104 and J2105 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.
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
2. Remove the unit cover
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 it on any surface.
3. Attach the wrist strap.
4. Locate the jumpers on the system board and change the selection of jumpers J2104
and J2105 to position B.
5. Detach the wrist strap.
6. Replace the unit cover.
7. Power-on the system.
TABLE C-6
Jumper
J2104
J2105
C-18 Ultra 1 Creator Series Service Manual • August 1996
Part number
Pins
*
*
Identifying Jumper Pins
Serial Port Jumper Settings
Pins 1 + 2 Select
RS-232
RS-232
*
TABLE C-6
Pins 2 + 3 Select
RS-423
RS-423
identifies serial port
Default Jumper on Pins
2 + 3
2 + 3