Quatech RS-485 user manual Rclk, Tclk

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7.2 RCLK

This is the clock signal used by the receiver portion of the UART. It is generally provided by connecting it to the UART's own transmit clock output (TCLK). This is done by not connecting pins 1 and 2 of the jumper block J13. If desired, RCLK can be received from an external source over the AUXIN line by connecting pins 1 and 2 of the jumper block J13. Figure 17 shows how to select the RCLK mode.

Jumper J13

J13

RCLK0_SEL

J13

Loopback TCLK to RCLK

RCLK0_SEL

Receive RCLK on AUXIN

Figure 17 --- RCLK selection

7.3 TCLK

This is the output clock signal used by the transmitter portion of the UART. It is generally connected to the UART's own receive clock input (RCLK). This is done by not connecting pins 1 and 2 of the jumper block J13. If desired, TCLK can be transmitted to an external source over the AUXOUT line by connecting pins 1 and 2 of the jumper block J12. Figure 18 shows how to select the TCLK mode.

Jumpers J11-13

J11

J13RCLK0_SEL

J12

J13

AUX0_SEL0 AUX0_SEL1 RCLK0_SEL

Loopback TCLK to RCLK

Transmit TCLK on AUXOUT

Figure 18 --- TCLK selection

Quatech DSC-200/300 User's Manual

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Image 36

Contents DSC-200/300 Date of Purchase Model Number Page Declaration of Conformity IND Option --- Surge Suppression Upgrade Changing Resource Settings with Device Manager2 AUX0SEL1,0, AUX1SEL1,0 J12,11,19,18 4 TGL0SEL1,0, TGL1SEL1,0 J15,14,22,21External Connections Half-Duplex/Full-Duplex/Auto-Toggle SelectionGeneral Information Features DSC-200/300 Product Series SummarySignal Connections Full-duplex/Half-duplex OperationJumpers J10-J23 define the options for this card 1 CTS0SEL, CTS1SEL J10,17 RCLK0SEL, RCLK1SEL J13RXEN0SEL, RXEN1SEL J16 Enable Scratchpad Register SPAD, J2 Clock Rate and Optional RegistersClock multiplier jumper options Hardware Installation Base Address and Interrupt Level IRQ Enabling the Special Registers Interrupt Status RegisterQuatech Modem Control Register Quatech Modem Control RegisterOptions Register Bit Name DescriptionClock Rate Multiplier RR1 RR0Windows Millennium Windows Windows Windows Windows NT Viewing Resources with Device Manager Quatech DSC-200/300 PCI Two-Port RS-422/RS485 Serial Adapter Adapter Data Rate Multiplier Application. This mode is useful for legacy Used when external handshaking or Page OS/2 DOS and other operating systemsQTPCI.EXE QTPCI.EXE Expert Mode display RTS/CTS Handshake Jumpers J10-12Rclk TclkAUXIN/AUXOUT Loopback AUXIN/AUXOUT loopbackHalf/full-duplex and Auto-Toggle selection Termination Resistors RS-422/485 TerminationDSC-200/300 connector definitions RS-422/485 Peripheral ConnectionPCI Resource Map Specifications Computer will not boot up