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Technical Description

Sealevel Systems ULTRA COMM+I.LPCI Page 8

Technical Description

The Sealevel Systems ULTRA COMM+I.LPCI provides a PCI interface adapter with an isolated asynchronous

serial port providing a versatile interface, field selectable as RS-232 for modems, printers and plotters, as well as

RS-422/485 for industrial automation and control applications. Isolation is important in installations where the

equipment being connected to the PC is either far from the PC, or on a different power transformer circuit. Ground

loop current is a commonly neglected and misunderstood phenomenon that leads to data loss and the destruction of

communications interfaces.

The ULTRA COMM+I.LPCI utilizes the 16C850 UART. This chip features programmable baud rates, data

format, interrupt control and industry leading 128-byte FIFOs.

Connector Pin Assignments

RS-232 Signals (DB-25 Male)

Signal Name Pin # Mode

GND Ground 7

RD Receive Data 3 Input

CTS Clear To Send 5 Input

TD Transmit Data 2 Output

RTS Request to Send 4 Output

Technical Note: Please terminate any control signals that are not going to be used. The most common way to do this

is connect RTS to CTS. Terminating these pins, if not used, will help insure you get the best performance from your

adapter.

RS-422/485/530 Pin Assignments (DB-25 Male)

Signal Name Pin # Mode

GND Ground 7

RDB RX+ Receive Data Positive 16 Input

RDA RX- Receive Data Negative 3 Input

CTSB CTS+ Clear To Send Positive 13 Input

CTSA CTS- Clear To Send Negative 5 Input

TDB TX+ Transmit Data Positive 14 Output

TDA TX- Transmit Data Negative 2 Output

RTSB RTS+ Request To Send Positive 19 Output

RTSA RTS- Request To Send Negative 4 Output

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 18 19

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Impulse 7108 Manual de usuario Pagina 10