Quatech QSC(LP)-300 user manual Termination Resistors, RS-422/485 Termination

Page 28

6.7 Termination Resistors

No termination resistors are provided on the ports. Both output and input signals are connected only to the external connector. Any termination which is required must be added externally.

RS-422/485 Receiver

+RXD+ Rt

-RXD-

RS-422/485 Receiver

+AUXIN+

-AUXIN-

Recommended Termination Resistor Values

RS-422	RS-485
100 ohm 1/2W resistor	60 ohms total resistance
	(120 ohms at each end)

Figure 6. RS-422/485 Termination

Quatech QSC(LP)-200/300 User's Manual

Image 28

Contents QSCLP-200/300 Date of Purchase Model Number Page Declaration of Conformity IND Option --- Surge Suppression Upgrade General InformationExternal Connections PCI Resource MapSpecifications Troubleshooting Features QSCLP-200/300 Product Series SummarySignal Connections Hardware Configuration1 AUX1,2,3,4 pins 3 and 4, 7 and 8, 11 and 12, 15 Force High-Speed Uart Clock X8, pins 17 Hardware Installation Jumper/connector locationsWindows Configuration Windows MillenniumWindows Windows Page Windows Windows NT Viewing Resources with Device Manager AdapterPage Changing Resource Settings with Device Manager RS-422/485 Serial AdapterData Rate Multiplier Page Page OS/2 Other Operating SystemsDOS and other operating systems QTPCI.EXE QTPCI.EXE Expert Mode display DTR/DSR or RTS/CTS Operation RTS/CTS HandshakeRclk TclkAUXIN/AUXOUT Loopback Termination Resistors RS-422/485 Termination44 connector definitions RS-422/485 Peripheral ConnectionAUXOUT+ Auxout AUXIN+ Auxin GND Base Address and Interrupt Level IRQ Port Address RangeSpecifications Computer will not boot up QSCLP-200/300 Revision November 940-0146-114