HP t505 Troubleshooting Manual page 20

To configure the serial ports:
1. Locate the serial port and jumper.
2. Place jumpers on the appropriate pins. (See
on page 15
CAUTION:
verify COM Port Jumper locations and supported configurations before you configure a serial
port. See
2-3 Configuring Serial Port Power on page 15
configurations.
Table 2-1 COM Port Default Configuration
pin #
pin 1
pin 2
pin 3
pin 4
pin 5
pin 6
pin 7
pin 8
pin 9
Table 2-2 COM Port Functionality
pin #
pin 1
pin 2
pin 3
pin 4
pin 5
pin 6
pin 7
pin 8
pin 9
14 Chapter 2 Hardware Changes
to determine the appropriate pins.)
An unsupported configuration can cause severe equipment damage. Carefully
Figure 2-4 Serial Port Jumper Locations on the System Board on page 13
COM1
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
RI
COM1
(Standard)
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
RI
Table 2-3 Configuring Serial Port Power
for Jumper locations and supported
COM2 COM3
+5V +5V
RXD RXD
TXD TXD
DTR DTR
GND GND
DSR DSR
RTS RTS
RXD (TTL) CTS
TXD (TTL) RI
COM2–Cable COM3
Connection
(Customized)
(Customized)
+5V/DCD +5V/+12V/DCD
RXD/TXD/RXD (TTL)/ RXD/TXD
TXD (TTL)
TXD/RXD/TXD (TTL)/ TXD/RXD
RXD (TTL)
DTR/+5V DTR/+5V/+12V
GND GND
DSR DSR
RTS RTS
RXD/TXD/RXD (TTL)/ CTS
TXD (TTL)
TXD/RXD/TXD (TTL)/ RI
RXD (TTL)
and Table
COM4
+5V
RXD
TXD
DTR
GND
DSR
RTS
CTS
RI
COM4
(Customized)
+5V/+12V/DCD
RXD/TXD
TXD/RXD
DTR/+5V/+12V
GND
DSR
RTS
CTS
RI