Quatech SSCLP-200, SSCLP-300, DSCLP-200, DSCLP-300 user manual

Page 33

Receive Control

 

Receivers are always enabled. In

Always Receive

a Half Duplex mode, you will

receive what you transmit

 

 

(sometimes called echo).

 

Receivers are only enabled when

When NOT Tranmitting

not transmitting. In a Half

Duplex mode, you will not

 

 

receive what you transmit.

RS-422/485 Duplex Mode

 

Transmitters and receivers are

 

always enabled; ports can send

Full Duplex

and receive simultaneously.

 

Used in four-wire

 

communication.

 

RTS is set to enable the

Half Duplex using RTS

transmitters. Used in two-wire

 

communication.

 

DTR is set to enable the

Half Duplex using DTR

transmitters. Used in two-wire

 

communication

 

Hardware automatically enables

 

the transmitters when

 

transmitting. Transmitters will

Auto Toggle

turn off three bit-times after the

 

last stop bit of the last character,

 

regardless of baud rate. Used in

 

two-wire communication.

8.To summarize the RS-422/485 output drivers enable options: The DSCLP-200/300’s ports may be configured for either full duplex or half duplex operation with this option. The default setting is the RS-422/485 ports are configured for full duplex operation with the RS-422/485 output drivers always enabled. In half duplex mode, the RS-422/485 transmitter may be enabled and disabled via the RTS (request to send) or DTR (data terminal ready) signals, or in auto-toggle mode, set to enable only when data is being transmitted. Both RTS and DTR are controlled through the Modem Control Register of the 16550.

9.Click the "Port Settings" tab and then click the "Advanced" button. The DSCLP-200/300 driver will display a custom Advanced Port Settings control, which allows the ports UART compatibility mode and FIFO threshold levels to be configured. The threshold values of

DSCLP/SSCLP-200/300 User's Manual

33

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Contents DSCLP/SSCLP-200/300 Warranty Information Iii Manufacturers Address Manufacturers NameApplication of Council Directive Standards to which Conformity is DeclaredHardware Installation Address Map and Special Registers Hardware ConfigurationRS-422 or RS-485 Signal Line Termination Base Address and Interrupt Level IRQHalf-Duplex/Full-Duplex/Auto-Toggle Selection Page General Information Jumpers J6-J9 Full-duplex/Half-duplex Operation Signal ConnectionsRight Card Edge Jumpers Jumpers J10-J23 define the options for this card1 CTS0SEL, CTS1SEL J10 Enable Scratchpad Register SPAD, J2 Clock Rate and Optional RegistersForce High-Speed Uart Clock X2, X4, or X8 J3, 4 Clock multiplier jumper options Jumper/connector locations Hardware InstallationChannel Address Range Interrupt Status Register Enabling the Special RegistersDlab Bit Spad Jumper Register selected for Bit DescriptionQuatech Modem Control Register Quatech Modem Control RegisterOptions Register Bit Name DescriptionWrite Read Clock Rate Uart Clock Maximum Data Multiplier Frequency Clock Rate MultiplierWindows Millennium Windows ConfigurationsWindows Windows Page Windows Windows NT Viewing Resources with Device Manager Two-Port RS-422/RS485 Serial Adapter Page DSCLP-200/300 Two-Port RS-422/485 Serial Adapter Page Page Page Page Other Operating Systems OS/2DOS and other operating systems QTPCI.EXE QTPCI.EXE Expert Mode display Jumper/Channel correspondence External ConnectionsRclk RTS/CTS HandshakeAUXIN/AUXOUT Loopback TclkHalf-Duplex/Full-Duplex/Auto-Toggle Selection Half/full-duplex and Auto-Toggle selection RS-422/485 Line termination resistance values Termination ResistorsRS-422/485 Peripheral Connection DSCLP-200/300 connector definitionsINTA# PCI Resource MapWith 64-byte FIFOs optional SpecificationsTroubleshooting Computer will not boot upCannot communicate with other equipment DSCLP/SSCLP-200/300
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