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IC1474A-F 703 p. 2 / 2 5853
Biasing Resistors
The biasing resistors for the RS-422/RS-485 receiver are 4.7k Ohm resistors. These resistors are
labeled R1 and R2 (See Figure 2).
Figure 2
+5V
DCD
1
3
2
5
TD
GND
RD
R2
7
8
4
6
CTS
DTR
DSR
RTS
Circuit
Power
Conversion
R1
4.7k
TD(B)+
TD(A)-
RD(B)+
RD(A)-
GND
3
8
7
2
4
4.7k
RS-232
DB9 female
RS-422
DB9 female
Specifications
Communication: RS-422
Data Rate: 115.2 kbps max.
Power: Port-Powered from handshake lines on the RS-232 side.
Dimensions: 6.1 x 3.3 x 1.7 cm (2.4 x 1.3 x 0.66 in)
Temperature Rating: 0 to 70°C
NOTE: When using an external supply, the supply should be connected only to specifically
labeled power inputs (power jack, terminal block, etc.). Connecting an external power supply to
the handshake lines may damage the unit. Contact technical support for more information on
connecting an external power supply to the handshake lines.
Black Box Corporation - 1000 Park Drive - Lawrence, PA 15055-1018
Tech Support and Ordering: 724-746-5500 - Fax: 724-746-0746
To contact us about Black Box products or services:
info@blackbox.com
Model Number: IC1474A-F
Description: 9-Pin Port-Powered RS-422 Converter
Type: Light industrial ITE equipment
Standards: EN 50082-1 (IEC 801-2, IEC 801-3, IEC 801-4)
EN 50081-1 (EN 55022, IEC 1000-4-2)
EN 61000 (-4-2, -4-3, -4-4, -4-5, -4-6, -4-8, -4-11)
ENV 50204
EN 55024