Black Box IC1473A-F User manual

IC1473A-F 703 p1 / 2 5852
Port Powered RS-232 to RS-422 Converter,
DB9F to Terminal Block
Product Code IC1473A-F
The unit is a port-powered two-channel RS-232 to RS-422 converter. It converts TD and RD RS-232
lines to balanced RS-422 signals. The converter can be powered from the RS-232 handshake lines, DTR
and RTS. If port-powering the unit, at least one of these handshake lines must be present, but can be in
any state. It can also be powered externally on the terminal blocks. The RS-422 driver and receiver are
always enabled.
To satisfy the requirements of some software packages, the RS-232 handshake lines are looped
back (tied together). RTS is connected to CTS, and DTR is connected to DSR and DCD.
Connections
This model is configured to transmit both directions between an RS-232 and RS-422 system. The
RS-232 side is pinned out to connect directly into the COM port on your computer or any other DTE
device (Table 1). Connections to the RS-422 side of the converter are made through terminal blocks.
When connecting to an RS-422 system, the converter must be connected with the proper polarity as
shown in Figure 1. When no data is being sent and the driver enabled, the RS-232 line is negative and
the RS-422 line TD(A) is negative with respect to TD(B).
Table 1 - RS-232 Pin Out
Figure 1 - Connection to a RS-422 System
TD(B)+
RD(A)-
RD(B)+
GND
TD(A)-
GND
RD(A)-
TD(A)-
RD(B)+
TD(B)+
422PP9TB
terminal blocks RS-422
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).
Black Box Corporation - 1000 Park Drive - Lawrence, PA 15055-1018
Tech Support and Ordering: 724-746-5500 - Fax: [phone]
To contact us about Black Box products or services: [email protected]
Signal DB-9 Female Pin #
TD 3
RD 2
RTS 7
CTS 8
DTR 4
DSR 6
DCD 1
GND 5
Converter
Terminal Block

IC1473A-F 703 p2 / 2 5852
Figure 2
DCD
1
3
2
5
TD
GND
RD
R2 4.7k
TD(B)+
TD(A)-
RD(B)+
RD(A)-
GND
+5V
7
8
4
6
CTS
DTR
DSR
RTS
Circuit
Power
Conversion
R1
4.7k
+12VDC
RS-232
DB9 female
RS-422
terminal blocks
Specifications
Communication: RS-422
Data Rate: 115.2 kbps max.
Power: Port-powered from handshake lines on the RS-232 side, or 12 to 16 VDC at 40
mA on the terminal blocks.
Dimensions: 3.5 x 1.3 x 0.7 in (8.9 x 3.3 x 1.7 cm)
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: [phone]
To contact us about Black Box products or services: [email protected]
Model Number: IC1473A-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