Measurement-computing PCI-COM422/485 Manual de usuario descargar pdf (Pagina 19)

5. SPECIFICATIONS

Typical for 25°C unless otherwise specified.

OWER CONSUMPTION

+5V

PCI-COM422/485 240mA typ.

PCI-COM422/485-2 250mA typ.

OMMUNICATIONS SECTION

Number of Ports

PCI-COM422/485 1

PCI-COM422/485-2 2

Port Type RS422 or RS485 (software selectable)

UART 16C550

Data Rate Up to 460 kbaud, software selectable

Miscellaneous RS485 mode is software programmable for RTS Enable,

DTS Enable or Automatic Enable

DB9F female 9-pin D connector

NPUT

UTPUT

SECTION

Data Transceiver type SP491

Data Rate 5Mbps min.

Data Transceiver Output Characteristics

Vol0.4V max. (Iout= +4mA)

Voh 3.5V min. (Iout= -4.0mA)

Differential Output Voltage GND to Vcc (unloaded)

Short Circuit Current ±250mA

Propagation Delay 30ns typ. (tplh/tphl)

Driver Enable to Output High 40ns typ.

Driver Enable to Output Low 40ns typ.

Driver Disable Time to Low40ns typ.

Driver Disable Time to High 40ns typ.

Data Transceiver Input Characteristics

Vil 0.8V max.

Vih2.0V min.

Maximum Input Voltage ±14V

Differential Threshold Voltage ±0.2V

Input Current 1mA (Vin = 12V)

-0.8mA (Vin=-7V)

Propagation Delay 90ns typ. (tplh/tphl)

Receiver Enable to Output Low 20ns typ.

Receiver Enable to Output High 20ns typ.

Receiver Disable from Low 20ns typ.

Receiver Disable from High 20ns typ.

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Measurement-computing PCI-COM422/485 Manual de usuario Pagina 19

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