10specifications – Quatech Asynchronous Communications Adapter DSC-200/300 User Manual

Page 37

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10Specifications

Bus interface PCI, 32-bit bus, 5-volt only

IBM-compatible computers

Dimensions:

approx. 5.5" x 3.5"

Serial ports

Controller:

16750 with 64-byte FIFOs

Interface:

Two female D-9 connectors

Transceivers:

SP491 or compatible

Differential output:

2V min. with 50-ohm load (RS-422)
1.5V min. with 27-ohm load (RS-485)

Output rise/fall time: 3ns min., 40ns max., 15ns typ.
Differential input
Threshold:

-0.2V min., +0.2V max.

Input resistance:

12k ohm min., 15k ohm typ.

Input current:

+/- 1.0mA max.

Power requirements

+5 volts:

approx. 320 mA

Temperature:

operating 0° to 70°
storage -50° to 80°

Humidity:

10% to 90%

Quatech DSC-200/300 User's Manual

37

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