Quatech DS-200/300 user manual RTS/CTS handshake, Rclk, Xclk

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7.1 RTS/CTS handshake

Transmission of RTS, combined with reception of CTS, allows for hardware handshaking (data flow control) between the UART and the external device. RTS is transmitted on AUXOUT by connecting pins 4 and 5 of the jumper pack. CTS is received on AUXIN by connecting pins 1 and 2 of the jumper pack. If RTS/CTS handshaking is not desired, the RTS output can be looped back to the CTS input by connecting pins 1 and 4 of the jumper pack. Figure 17 shows how to select the RTS/CTS mode.

AUXOUT

 

XCLK

AUXOUT

RTS

 

 

RTS

5

6

6

 

1

2

3

CTS

 

 

 

 

 

 

CTS

 

 

 

 

 

 

AUXIN

 

 

 

RCLK

AUXIN

 

 

 

Transmit RTS on AUXOUT

Receive CTS on AUXIN

XCLK

5

5

6

1

2

3

RCLK

Loopback RTS to CTS

Figure 17 --- RTS/CTS selection on J5, J7

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 (XCLK). This is done by connecting pins 3 and 6 of the jumper pack. If desired, RCLK can be received from an external source over the AUXIN line by connecting pins 2 and 3 of the jumper pack. Figure 18 shows how to select the RCLK mode.

AUXOUT RTS

XCLK AUXOUT RTS

XCLK

4

5

7

 

1

2

3

 

CTS

 

 

CTS

AUXIN

 

RCLK

AUXIN

Loopback XCLK to RCLK

4 5 6

1

2

3

RCLK

Receive RCLK on AUXIN

Figure 18 --- RCLK selection on J5, J7

7.3 XCLK

DS-200/300 User's Manual

7-2

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Contents DS-200/300 Page DS-200/300 Warranty InformationQuatech Inc Iii Table of Contents General Information This Page Intentionally Left Blank Installation Photo of DS-200/300 Quatech Inc Using the Add New Hardware Wizard Windows 95 ConfigurationQuatech Inc Viewing and Changing Resources with Device Manager Page Page Addressing Ports Setting the addressSerial 0 uses SW1 and SW2 Serial 1 uses SW3 and SW4 Recommended addresses for serial ports Enabling or disabling portsData Rate Multiplier Data Rate Multiplier Jumper BlockOptions Register Options Register bit definitions This Page Intentionally Left Blank Interrupt level IRQ selection Quatech Inc Interrupt Level IRQInterrupt Sharing Interrupt Status Register Interrupt Status Register contents Quatech IncThis Page Intentionally Left Blank Jumper/Channel/Function correspondence Output ConfigurationRTS/CTS handshake RclkXclk Xclk selection on J5, J7 AUXIN/AUXOUT LoopbackJ6/J8 J6 = Serial0 J8 = Serial1 Half Duplex/Full Duplex selectionOutput control block diagram Factory Default Configuration of DS-200/300RS-422/485 Peripheral Connection Termination ResistorsDS-200/300 connector definitions for RS-422/485 This Page Intentionally Left Blank Baud Rates SpecificationsQuatech Inc Computer will not boot up TroubleshootingPage DS-200/300 Revision March