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Quatech DS-302 User Manual

Quatech dual channel rs-422 / rs-485 asynchronous communication board
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Q u a t e c h I n c . w a r r a n t s t h e
t o b e f r e e o f d e f e c t s f o r
date of purchase.
any board that fails to perform under normal operating
c o n d i t i o n s
a n d
o u t l i n e d i n t h i s d o c u m e n t d u r i n g t h e w a r r a n t y p e r i o d .
A n y d a m a g e t h a t r e s u l t s f r o m i m p r o p e r i n s t a l l a t i o n ,
operation, or general misuse voids all warranty rights.
Although every attempt has been made to guarantee
t h e a c c u r a c y o f t h i s m a n u a l , Q u a t e c h I n c . a s s u m e s n o
l i a b i l i t y f o r d a m a g e s r e s u l t i n g f r o m e r r o r s i n t h i s
document.
Quatech Inc. reserves the right to edit or
append to this document at any time without notice.
P l e a s e c o m p l e t e t h e f o l l o w i n g i n f o r m a t i o n a n d
r e t a i n
f o r
y o u r
available when requesting warranty service.
DATE OF PURCHASE:
MODEL NUMBER:
PRODUCT DESCRIPTION:
SERIAL NUMBER:
I B M T M , P C / X T T M , P C / A T T M , a n d P S / 2 T M a r e t r a d e m a r k s o f
International Business Machines.
WARRANTY INFORMATION
Quatech Inc. will repair or replace
i n
a c c o r d a n c e
r e c o r d s .
D S - 2 0 2
/ D S - 3 0 2
D U A L
C H A N N E L
A S Y N C H R O N O U S
i
D S - 2 0 2 / D S - 3 0 2
o n e ( 1 ) y e a r
w i t h
t h e
H a v e
t h i s
i n f o r m a t i o n
R S - 4 2 2
C O M M U N I C A T I O N
f r o m t h e
p r o c e d u r e s
/ R S - 4 8 5
B O A R D

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Summary of Contents for Quatech DS-302

  • Page 1 Quatech Inc. reserves the right to edit or append to this document at any time without notice.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS WARRANTY INFORMATION ... . LIST OF FIGURES ... . . INTRODUCTION ....BOARD DESCRIPTION .
  • Page 3 INTRODUCTION LIST OF FIGURES Figure DS-202/DS-302 board layout ..* internal registers Figure 16450/16550 . . . Figure Interrupt source identification . . . Figure FIFO receiver trigger levels ..Figure Parity options ... .

  • Page 4: Introduction

    B O A R D D E S C R I P T I O N A component diagram of the DS-202 / DS-302 showing the locations of the 16450 ACEs, configuration jumpers, a d d r e s s s e l e c t i o n s w i t c h e s , a n d o u t p u t c o n n e c t o r s i s shown in figure 1.
  • Page 5 Figure 1. DS-202 / DS-302 component layout.
  • Page 6 FUNCTIONAL DESCRIPTION D e s i g n e d t o b e c o m p a t i b l e w i t h t h e 1 6 4 5 0 , t h e 1 6 5 5 0 A C E e n t e r s c h a r a c t e r m o d e o n r e s e t a n d i n t h i s m o d e a p p e a r s a s a 1 6 4 5 0 t o a p p l i c a t i o n s o f t w a r e .

  • Page 7: Interrupt Enable Register

    FUNCTIONAL DESCRIPTION I N T E R R U P T E N A B L E R E G I S T E R +-------+ D7 | +-------+ D6 | +-------+ D5 | +-------+ D4 | +-------+ D3 | EDSSI |----- MODEM status +-------+ D2 | ELSI |----- Receiver line status...

  • Page 8: Interrupt Identification Register

    FUNCTION AL DESCRIPTION I N T E R R U P T I D E N T I F I C A T I O N R E G I S T E R +------+ D7 | FFE |--+ +------+ +-- FIFO enable D6 | FFE |--+...

  • Page 9: Fifo Mode

    FUNCTIONAL DESCRIPTION +--------------------+----------+----------------------+ | IID2 IID1 IID0 IP | Priority | Interrupt Type +--------------------+----------+----------------------+ | None 0 | Highest | Receiver Line Status | 0 | Second | Received Data Ready 0 | Second | Character Timeout (FIFO mode only) 0 | Third | Transmitter Holding Register Empty...

  • Page 10: Fifo Control Register

    DMAM - DMA Mode Select: When set (logic 1), RxRDY and TxRDY change from mode 0 to mode 1. (DMA mode is not supported by the DS-202 / DS-302.) XRST - Transmit FIFO Reset: When set (logic 1), all bytes in the transmitter F I F O a r e c l e a r e d a n d t h e c o u n t e r i s r e s e t .

  • Page 11: Line Control Register

    FUNCTIONAL DESCRIPTION RRST - Receive FIFO Reset: W h e n s e t ( l o g i c 1 ) , a l l b y t e s i n t h e r e c e i v e r FIFO are cleared and the counter is reset.
  • Page 12 FUNCTIONAL DESCRIPTION STKP - Stick Parity: Forces parity to logic 1 or logic 0 if parity is enabled. See EPS, PEN, and figure 5. - Even Parity Select: Selects even or odd parity if parity is enabled. See STKP, PEN, and figure 5. - Parity Enable: E n a b l e s p a r i t y g e n e r a t i o n o n t r a n s m i s s i o n a n d v e r i f i c a t i o n o n r e c e p t i o n .

  • Page 13: Modem Control Register

    . OUT1 is unused on the DS-202 / DS-302. - Request To Send: Controls the RTS output as described above.

  • Page 14: Line Status Register

    FUNCTIONAL DESCRIPTION L I N E S T A T U S R E G I S T E R +------+ D7 | FFRX |----- Error in FIFO RCVR (FIFO only) +------+ D6 | TEMT |----- Transmitter empty +------+ D5 | THRE |----- Transmitter holding register empty +------+ D4 | |----- Break interrupt...
  • Page 15 FUNCTIONAL DESCRIPTION B i t s B I , F E , P E , a n d a r e t h e s o u r c e s r e c e i v e r l i n e s t a t u s i n t e r r u p t s . T h e s e b i t s are reset by reading the line status register.

  • Page 16: Modem Status Register

    FUNCTIONAL DESCRIPTION M O D E M S T A T U S R E G I S T E R +------+ D7 | DCD |----- Data carrier detect +------+ D6 | |----- Ring indicator +------+ D5 | DSR |----- Data set ready +------+ D4 | CTS |----- Clear to send...

  • Page 17: Scratchpad Register

    FUNCTIONAL DESCRIPTION S C R A T C H P A D R E G I S T E R This register is not used by the 16450/16550. may be used by the programmer for data storage. O P E R A T I O N * F I F O I N T E R R U P T M O D E...
  • Page 18 BAUD RATE SELECTION +---------+ +---------+ 4| _ +_ _ |6 4| _--_ _ |6 1| _ +_ _ |3 1| _ _--_ |3 +---------+ +---------+ (a) ÷1 input clock (b) ÷2 input clock +---------+ +---------+ 4| _ _--_ |6 1| _--_ +_ |4 1| _--_ _ |3 2| _--_ +_ |5...

  • Page 19: Addressing

    BAUD RATE SELECTION A D D R E S S I N G E a c h c h a n n e l o f t h e D S - 2 0 2 / D S - 3 0 2 u s e s e i g h t c o n s e c u t i v e I / O a d d r e s s l o c a t i o n s i n t h e r a n g e 0 t o 0 7 F F H e x .

  • Page 20: Address Selection Examples

    ADDRESSING ON +-++-++-+ +-++-++-++-+ |_|| || | | || || || | | ||_||_| |_||_||_||_| +-++-++-+ +-++-++-++-+ BASE ADDRESS = 03F8H ON +-++-++-+ +-++-++-++-+ |_|| ||_| | || || || | | ||_|| | |_||_||_||_| +-++-++-+ +-++-++-++-+ BASE ADDRESS = 02F8H ON +-++-++-+ +-++-++-++-+ |_|| || |...

  • Page 21: Interrupts

    I N T E R R U P T S Each channel of the DS-202 / DS-302 may select one o f s i x p o s s i b l e i n t e r r u p t r e q u e s t l e v e l s ( I R Q 2 - 7 ) .

  • Page 22: Output Configurations

    Four sets of jumpers are implemented on the DS-202 / DS-302 to control the auxiliary channel configuration a n d t r i - s t a t e o u t p u t d r i v e r s .
  • Page 23 OUTPUT CONFIGURATION received by connecting pins 1 and 2 (figure 16a). R T S / C T S h a n d s h a k e c a n b e d e f e a t e d b y l o o p i n g t h e R T S output back to the CTS input.

  • Page 24: Auxiliary Channel Signal Selection

    OUTPUT CONFIGURATION AUXOUT AUXOUT RTS ----+ +---- XCLK RTS ----+ +---- XCLK +---------+ +---------+ 4 | _--_ _+| 6 4 | _+ _--_ | 6 1 | _--_ _+| 3 1 | _+ _--_ | 3 +---------+ +---------+ CTS ----+ +---- RCLK CTS ----+ +---- RCLK...
  • Page 25 OUTPUT CONFIGURATION H a l f D u p l e x O p e r a t i o n The function of jumpers J7 and J9 is to configure t h e c o m m u n i c a t i o n c h a n n e l f o r h a l f...

  • Page 26: External Connections

    OUTPUT CONFIGURATION VIII. E X T E R N A L C O N N E C T I O N S Connections to peripheral equipment are made via f e m a l e D - 9 c o n n e c t o r s C N 1 a n d C N 2 . A p i n - o u t o f t h e c o n n e c t o r s a n d a d e s c r i p t i o n o f e a c h c o n n e c t o r s i g n a l is given in the figures below.

  • Page 27: Installation

    DS-202/DS-302. Turn unit off. Remove system cover as instructed in the computer reference guide.

This manual is also suitable for:

Ds-202

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