Quatech Freedom USB Adapter User’s Manual Making external connectionsTesting RS-422/485 portsMaking a loopbackStep Procedure Description Step 1 Turn off the computer. Step 2 Connect the following signals on serialport 1. Repeat for each serial port.AuxOut+ (pin 1) to AuxIn+ (pin 5)TxD+ (pin 2) to RxD+ (pin 4)TxD– (pin 7) and RxD– (pin 8)AuxOut– (pin 6) to AuxIn– (pin 9)Repeat for each serial port.Use any kind of conductive wire, even apaper clip. Step 3 Turn on the computer. You are now ready to test each portindividually.Figure 43 - RS-422/485 DB-9 connector Install wire jumpers to connect thefollowing signals:AuxOut+ (pin 1) to AuxIn+ (pin 5)TxD+ (pin 2) to RxD+ (pin 4)TxD– (pin 7) to RxD– (pin 8)AuxOut– (pin 6) to AuxIn– (pin 9)Figure 43 illustrates thejumper location for a loopbackon the RS-422/485 DB-9connector for Freedom USB-200/300s.Running HyperterminalStep Procedure Description Step 1 Launch HyperTerminal. In Windows, select Programs/Accessories/ Communications/HyperTerminal. Step 2 Create a new session. When prompted, give the session anyname you wish. Step 3 Select the COM # associated with port 1from the drop down list.You are now set up to test the first serialport.Note: Leave all settings at default. Step 4 With the session open, type any text. If the text you type is echoed on thescreen, the port is functioning properly. Step 5 Close the session. Step 6 Repeat steps 2 through 5 for each serialport.If the text you type is echoed on thescreen, the port is functioning properly.Rev 2.02 (2/24/2004) Page 33
