Quatech SSU2-400I operation manual RS-422 Pin Assignment

Page 24

Serial Device		USB to RS-232/422/485 Converter
2	RX	3	TX
3	TX	2	RX
5	GND	5	GND
7	RTS	8		(Flow Control)
			CTS
8	CTS	7		(Flow Control)
			RTS

□RS-422 Pin Assignment

The pin assignment scheme for a 4-pin RS-422 is given below.

1 2 3 4

RS-422:	PIN 1: T+	PIN 2: T- PIN 3: R+ PIN 4: R-
RS-485:	PIN 1: D+	PIN 2: D-

□RS-422 Wiring Diagram

Serial Device			USB to RS-232/422/485 Converter
R-			2	T-

		R+	1	T+
		T-	4	R-
		T+	3	R+

□RS-485 Wiring Diagram


Serial Device		USB to RS-232/422/485 Converter
	D-	2	D-
	D+	1	D+

23

Image 24

Contents USB to RS-232/422/485 Isolated Converter First Edition, Jun Table of Contents Introduction Package checklist Product Specification USB Port EMC FCC Class A, CE Class a Warranty 1 Year USB Type B Connector Product Panel Views DescriptionTerminator DIP Switches Serial I/O PortSerial I/O Port of RS-232/422/485 LED Indicators SYS Red RX OrangeTX Green Driver Installation Install CP210xVCPWin2KXPS2K3 softwareChoose Next Icon Choose Accept item of license agreement Execute the program installation Choose destination locationScan and install CP210x USB to Uart Bridge Driver Installer System Settings Change Notice InstallShield Wizard CompleteHardware Installation & Setup Hardware InstallationPage Hardware Setup Into Manage icon in My ComputerChoose Device Manager and click PortsCOM & LPT Detail parameters of CP210x USB to Uart Bridge ControllerDevice status of CP210x USB to Uart Bridge Controller Driver detail informationDetails item Pin outs and Connector Appendix aRS-422 Pin Assignment