DayTronic PC-HSICA Manuale di istruzioni - Pagina 5

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NTRODUCTION

The Model PC-HSICA is a half-height PC card which makes available to the com-

puter a "DB-25" RS-232-C port for asynchronous serial communication at a rate of

2400, 4800, 9600, 19.2K, 38.4K, or 153.6K baud. As an upgrade of the Daytronic

PC-HSIC card, the PC-HSICA offers enhanced EMI filtering and transient suppres-

sion, and employs a Startech 16C650 Universal Asynchronous Receiver / Trans-

mitter (UART)* to support high-speed communications between the computer

and Daytronic data-collection equipment. This UART features 32-byte receive and

transmit FIFO's with full trigger-level, error-flag, and interrupt capabilities.

The PC-HSICA is recommended for serial interchanges not only because of

speed, but also because it furnishes a true hardware handshake, thus reducing

the possible noise effects that can result from the use of a long interface cable.

While software-controlled handshaking is adequate for many applications, true

hardware handshaking is required for optimal communications with a Daytronic

data-collection instrument or system at 153.6K baud. Without the handshake, a

complete data transmission at this high rate of transfer might well be too fast for

the receiving equipment to handle. As explained in Section 2.c, such handshak-

ing is enabled via the HSIC.EXE software utility supplied with the PC-HSICA card.

When set to "HSIC" mode, the PC-HSICA performs the basic functions of the

16C650 UART, but at the same time may be used with any conventional 16C550-

compatible serial driver (including the DOS "MODE COM" or BASIC "OPEN

COM" command, or the Windows

When set to "16C650" mode, the PC-HSICA is equivalent to a stand-alone 16C650

UART with all its functional capability.* This mode of operation requires a custom

driver or a driver specifically intended for 16C650 communications.

As explained in Section 2.A.3, YOU MUST DEDICATE TO THE PC-HSICA CARD AN

I/O REGISTER ADDRESS AND AN INTERRUPT REQUEST NUMBER THAT IS NOT

PRESENTLY ASSIGNED TO ANY OTHER PORT OR DEVICE.

THUS, IF ALL FOUR OF YOUR PC'S COM PORTS ARE IN USE, IT WILL BE NECES-

SARY TO DISABLE ONE OF THEM TO MAKE ITS I/O ADDRESS EXCLUSIVELY

AVAILABLE TO THE PC-HSICA.

YOU CAN DEDICATE TO THE PC-HSICA EITHER OF THE TWO IRQ NUMBERS

SHOWN IN TABLE 1, BELOW, FOR THE COM PORT YOU HAVE DEDICATED TO

THE PC-HSICA (i.e., 4 or 7 for COM1, 3 or 7 for COM2, 4 or 7 for COM3, 3 or 7 for

COM4). ONCE DEDICATED TO THE PC-HSICA, AN IRQ NUMBER CANNOT BE

USED FOR ANY OTHER PURPOSE.

If you have any questions or problems determining your computer's open

addresses and IRQ's, contact the Daytronic Service Department at

(513) 866-3300.

* For a complete description of the ST16C650 UART, see the latest data from Startech

Semiconductor, Inc., 1215 Bordeaux Dr., Sunnyvale, CA, 94089; Tel: (408) 745-0801;

Fax: (408) 745-1269.

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