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AIMB-250 Series
40 AIMB-250 Series User’s Manual
2.4.9 Serial Port 1 Connector in RS-422 Mode (CN1)
Signal PIN PIN Signal
TxD- 1 2 RxD+
TxD+ 3 4 RxD-
GND 5 6 NC
NC 7 8 NC
NC 9 10 NC
2.4.9.1 Signal Description – Serial Port 1 Connector in RS-422 Mode (CN1)
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.