Quatech MPAP-100 Manuale utente

Syncdrive Plus

Communications Software

User’s Manual

QUATECH, INC.

662 Wolf Ledges Parkway

Akron, Ohio 44311

Toll free: 1-800-553-1170

TEL: (330) 434-3154

FAX: (330) 434-1409

http://www.quatech.com

Syncdrive Plus

User’s Manual P/N: 940-0184-100

CONNECT WITH RELIABILITY

information contained in this document cannot be reproduced in any form

without the written consent of Quatech, Inc. Any software programs that

might accompany this document can be used only in accordance with any

license agreement(s) between the purchaser and Quatech, Inc. Quatech,

Inc. reserves the right to change this documentation or the product to

which it refers at any time and without notice.

Trademarks QUATECH® is a registered trademarks of Quatech, Inc. IBM PC™,

PC-AT™, PS/2™, OS/2™, and Micro Channel™ are trademarks of

International Business Machines Corporation. Windows™ is a trademark

of Microsoft Corporation. Other product and brand names listed in this

manual may be trademarks of their respective owners.

Disclaimer The information in this manual is believed to be accurate and reliable at

the time of posting. Notwithstanding the foregoing, Quatech assumes no

responsibility for any damage or loss resulting from the use of this

manual, and expressly disclaims any liability or damages for loss of data,

loss of use, and property damage of any kind, direct, incidental or

consequential, in regard to or arising out of the performance or form of

the materials presented herein or in any software program(s) that may

accompany this document.

Changes or modifications to this device not explicitly approved by

Quatech will void the user's authority to operate this device.

Feedback Quatech, Inc. encourages and appreciates feedback concerning this

document. Please send any written comments to the Technical Support

department at the address listed on the cover page of this manual.

Quatech Syncdrive Plus User’s Manual Table of contents

Rev 01 (2/6/2003) Page i

Table of contents

Introduction----------------------------------------------------------------------------------------------------------------------- 1

System Requirements ---------------------------------------------------------------------------------------------------- 1

Installing Syncdrive plus------------------------------------------------------------------------------------------------ 2

Synchronous communication with Syncdrive Plus-------------------------------------------------------------------- 6

Understanding BIT-synchronous formatting---------------------------------------------------------------------- 6

Operational overview----------------------------------------------------------------------------------------------------------- 7

Data handling--------------------------------------------------------------------------------------------------------------- 7

Transmitting frames------------------------------------------------------------------------------------------------- 7

Receiving frames------------------------------------------------------------------------------------------------------ 8

Clocking parameters------------------------------------------------------------------------------------------------------ 8

Include file structure------------------------------------------------------------------------------------------------------ 9

Operating under Windows 2000/XP---------------------------------------------------------------------------------- 9

Building Syncdrive Plus applications -------------------------------------------------------------------------- 9

Terminating applications ------------------------------------------------------------------------------------------ 9

Tips and Techniques------------------------------------------------------------------------------------------------- 9

Syncdrive Plus data structures --------------------------------------------------------------------------------------------10

Syncdrive Plus application programming interface------------------------------------------------------------------16

Calling convention--------------------------------------------------------------------------------------------------------16

Return values --------------------------------------------------------------------------------------------------------------16

Examples--------------------------------------------------------------------------------------------------------------------17

Command reference------------------------------------------------------------------------------------------------------17

Using example programs-----------------------------------------------------------------------------------------------------29

Source code------------------------------------------------------------------------------------------------------------------29

Executable files------------------------------------------------------------------------------------------------------------29

Descriptions of example programs-----------------------------------------------------------------------------------29

LPBCKBI2K ----------------------------------------------------------------------------------------------------------29

FDBCKBI2K----------------------------------------------------------------------------------------------------------29

SENDBI2K ------------------------------------------------------------------------------------------------------------29

RECBI2K---------------------------------------------------------------------------------------------------------------30

THREADRX2K-------------------------------------------------------------------------------------------------------30

THREADTX2K-------------------------------------------------------------------------------------------------------30

Crossover cable-------------------------------------------------------------------------------------------------------30

Troubleshooting-----------------------------------------------------------------------------------------------------------------31

Verify that the hardware is configured properly ----------------------------------------------------------------31

Check the Syncdrive Plus configuration ---------------------------------------------------------------------------31

Check the clock sourcing------------------------------------------------------------------------------------------------31

Know the speed limits---------------------------------------------------------------------------------------------------31

Error codes -----------------------------------------------------------------------------------------------------------------------32

Appendix A-----------------------------------------------------------------------------------------------------------------------33

Definitions ------------------------------------------------------------------------------------------------------------------33

Quatech Syncdrive Plus User’s Manual Table of contents

Rev 01 (2/6/2003) Page ii

Table of figures

Figure 1 - Found new hardware prompt....................................................................................................2

Figure 2 - Welcome screen ..........................................................................................................................2

Figure 3 - Install Hardware Device Drivers screen...................................................................................3

Figure 4 - Locate Driver Files screen.........................................................................................................3

Figure 5 - Insert installation disk prompt .................................................................................................4

Figure 6 - Locate File screen.......................................................................................................................4

Figure 7 - Driver Files Search Results screen...........................................................................................5

Figure 8 - Completing the Found New Hardware Wizard screen............................................................5

Figure 9 - Syncdrive Plus bit-synchronous frame format.........................................................................6

Figure 10 - RS-232 Crossover cable pinouts............................................................................................30

Figure 11 - RS-422/485 Crossover cable pinouts.....................................................................................30

Quatech Syncdrive Plus User’s Manual Introduction

Rev 01 (2/6/2003) Page 1

Introduction

Syncdrive Plus is a synchronous communications software driver

package that helps users of Quatech synchronous communication

hardware to develop their application software.

The Syncdrive Plus driver package includes these features:

! Multiple communication channels using multiple MPA-series

adapters

! Support for bit-synchronous (SDLC, HDLC) communications

! User-control of most communication parameters

! Relieves programmers of the burden of directly programming the

synchronous communications hardware

! User can change or upgrade synchronous communication

hardware with minimal modifications to the application software

! Support for all Quatech MPA-series PCI bus and PCMCIA

adapters:

* MPAP-100: Multi-protocol RS-232 synchronous serial card

* MPAP-200/300: Multi-protocol RS-422/485 synchronous serial

card

* MPAC-100: Single port RS-232 synchronous board.

! Versions for Windows 2000 and Windows XP

Written specifically for use with C, Syncdrive Plus is also compatible

with other languages that support C-type subroutine interfaces.

System Requirements

The system requirements are as follows:

! PC running either Windows 2000 or Windows XP

! Available PCI slot or PC Card slot

We recommend that you install the latest service packs.

All other requirements are the same as for the respective operating

systems.

Note: For on-line technical

support, see Quatech’s Web site:

http://www.quatech.com/technical

.htm

Note: See Quatech’s Internet

site for the latest drivers and

updates:

http://www.quatech.com/.

Quatech Syncdrive Plus User’s Manual Introduction

Rev 01 (2/6/2003) Page 2

Installing Syncdrive plus

Follow this procedure to install your Quatech Syncdrive Plus

synchronous communication software.

Step Procedure Description

! Step 1 Insert the Quatech installation CD-ROM

into your CD-ROM drive. This is the CD that shipped with the

MPAX-XXX adapter.

! Step 2 Insert the MPAX-XXX adapter into any

available PC Card socket. The Found New Hardware prompt

displays briefly, followed by the Found

New Hardware Wizard’s Welcome screen.

Figure1- Foundnewhardwareprompt

Figure2-Welcomescreen

Step Procedure Description

! Step 3 Press Next to continue. The Install Hardware Device Drivers

screen displays.

Quatech Syncdrive Plus User’s Manual Introduction

Rev 01 (2/6/2003) Page 3

Figure3- InstallHardwareDeviceDriversscreen

Step Procedure Description

! Step 4 Select the Search for a suitable driver for

my device (recommended) option.

Press Next to continue.

The Locate Driver Files screen displays.

Figure4-LocateDriverFilesscreen

Step Procedure Description

! Step 5 Select the Specify a location option.

Press Next to continue. The Insert installation disk prompt

displays.

Quatech Syncdrive Plus User’s Manual Introduction

Rev 01 (2/6/2003) Page 4

Figure5- Insertinstallationdiskprompt

Step Procedure Description

! Step 6 Browse to the correct drive location on your

CD-ROM drive.

Click OK to continue.

The complete path is E:\Synchronous

Adapters\Software\Windows 2000,

XP\Syncdrive Plus. Replace E: with your

CD-ROM drive designation.

The Locate File screen displays.

Figure6- LocateFilescreen

Step Procedure Description

! Step 7 Select the Quainf.inf file and click Open. The Driver Files Search Results screen

displays, showing the path to the Quainf.inf

driver.

Quatech Syncdrive Plus User’s Manual Introduction

Rev 01 (2/6/2003) Page 5

Figure7-DriverFilesSearchResultsscreen

Step Procedure Description

! Step 8 Make sure the directory path ends at the

Quainf.inf file. Click Next to continue. The Completing the Found New Hardware

Wizard screen displays.

Figure8- CompletingtheFoundNewHardwareWizardscreen

Step Procedure Description

! Step 9 Click Finish to continue. The Installation Wizard completes the

installation of the Syncdrive Plus driver.

Note: You can find your

Syncdrive Plus adapter listed

in the Windows Device

Manager under Synchronous

Communication

Quatech Syncdrive Plus User’s Manual Synchronous Communication with Syncdrive Plus

Rev 01 (2/6/2003) Page 6

Synchronous communication with Syncdrive Plus

Most data communications in personal computers is handled

asynchronously using standard communication ports. Asynchronous

communication transfers data one character at a time with

significant overhead due to the addition of the start and stop bits

required for each character. These additions can decrease the rate of

data transfer by 20% or more.

In contrast, synchronous communication transfers data in a format

referred to as a frame. Each frame consists of a block of data plus a

fixed amount of overhead from the insertion of control, synchronization,

and error detection characters. Since the amount of overhead is

independent of the data block size, the percentage of the total

transfer time devoted to the frame overhead diminishes as the size of

the data block increases.

Synchronous communication is further divided into bit-synchronous

and byte-synchronous transfers. Bit-synchronous transfers treat the

data block as a series of data bits with no specific character

boundaries. Byte-synchronous transfers treat the data block as a

series of fixed-length characters.

The first release of Syncdrive Plus transfers data in bit-synchronous

mode only. The bit-synchronous mode can be used to implement such

protocols as SDLC or HDLC. Syncdrive Plus does not implement any

specific protocol itself, but supports most protocols implemented by

the application software. Future releases of Syncdrive Plus will add

support for byte-synchronous modes such as BISYNC.

Understanding BIT-synchronous formatting

Syncdrive's bit-synchronous mode generates a frame formatted

according to the scheme shown below.

Figure9- SyncdrivePlusbit-synchronousframeformat

flag data CRC flag

The hardware uses the frame's start flag and end flag characters for

synchronization purposes. When the application transmits a block of

data, Syncdrive Plus automatically appends these flag characters to

the frame. When receiving a frame, the driver automatically removes

these flag characters from the frame before returning it to the

application.

Syncdrive Plus uses the frame's CRC bytes for error detection

purposes. When transmitting a block of data, it automatically

generates and transmits the CRC after it sends all of the data. When

receiving a frame, Syncdrive Plus automatically checks the CRC to

determine if the frame was corrupted. If a CRC error occurs,

Syncdrive Plus returns an error code (see MPA_GetData() return

values).

Note: Syncdrive Plus uses

synchronous communication

for faster data transfer rates

with less overhead.

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