Omega-vehicle-security ISA RS-422 Manual de usuario descargar pdf (Pagina 14)

Technical Description

OMG-ULTRA-SIO Page 10

Technical Description

The OMG-ULTRA-SIO provides the PC with two additional ground isolated RS-

422/485 (P/N 3189) or two non-isolated RS-422/485 (P/N 3089) serial ports for

terminals, modems, printers, etc. 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 phenomena that leads to data loss and the destruction of

communications interfaces. The OMG-ULTRA-SIO isolated boards provide up

to 500 volts DC of isolation.

The OMG-ULTRA-SIO utilizes the 16550 UART. This chip features

programmable baud rate, data format, interrupt control and a 16 byte input and

output FIFO. A full array of UART upgrades is also available offering larger

FIFO’s. Contact technical support for details.

Features

• Automatic RS-485 driver enable/disable allows card to appear to be RS-232

requiring no additional drivers

• ‘PAL’ option allows for unique OEM address selection

• ‘Shareable’ IRQs allow more than one port to share a single IRQ providing a

polling type driver is used.

• IRQs 2/9-7, 10, 11, 12, 14, 15 supported

• 16550 buffered UARTs Standard

• 16 Bit address decode allows for easier integration

Connector Pin Assignments (DB 9 MALE)

Signal Name Pin # Mode

GND Ground 5

TX + Transmit Data Positive 4 Output

TX- Transmit Data Negative 3 Output

RTS+ Request To Send Positive 6 Output

RTS- Request To Send Negative 7 Output

RX+ Receive Data Positive 1 Input

RX- Receive Data Negative 2 Input

CTS+ Clear To Send Positive 9 Input

CTS- Clear To Send Negative 8 Input

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 24 25

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Omega-vehicle-security ISA RS-422 Manual de usuario Pagina 14