HP vc4825T HP vc4820T/vc4825T Thin Clients Hardware Reference Guide - Page 27
Serial Port Jumper Locations on the System Board, on Serial
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Table 2-2 COM Port Functionality pin # COM1 (Standard) pin 1 pin 2 DCD RXD pin 3 TXD pin 4 pin 5 pin 6 pin 7 pin 8 DTR GND DSR RTS CTS pin 9 RI COM2-Cable Connection (Customized) COM3 (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) COM4 (Customized) +5V/+12V/DCD RXD/TXD TXD/RXD DTR/+5V/+12v GND DSR RTS CTS RI CAUTION: To prevent severe equipment damage, carefully verify the location of the COM Port Jumper before you configure it. See Figure 2-10 Serial Port Jumper Locations on the System Board on page 19 for locations. NOTE: The jumpers in the following table are in the same orientation illustrated in Figure 2-10 Serial Port Jumper Locations on the System Board on page 19. Table 2-3 Configuring Serial Port Power ENWW Configuring Powered Serial Ports 21