HP AMD Geode ECM-5510 - Manual (Page 41)

User’s Manual
ECM-5510 User’s Manual 41
2.4.17 Serial Port 2 Connector in RS-422 Mode (CN6, Pin 11-20 )
Signal PIN PIN Signal
TxD- 11 12 RxD+
TxD+ 13 14 RxD-
GND 15 16 NC
NC 17 18 NC
NC 19 20 NC
2.4.17.1 Signal Description – Serial Port 2 Connector in RS-422 Mode (CN6, Pin
11-20 )
Signal Signal Description
TxD+/-
Serial output. This differential signal pair sends serial data to the communication
link. Data is transferred from Serial Port 2 Transmit Buffer Register to the
communication link, if the RTS register of the Serial Port 2 is set to LOW.
RxD+/-
Serial input. This differential signal pair receives serial data from the
communication link. Received data is available in Serial Port 2 Receiver Buffer
Register.