422PP9TB Datasheet

Two Channel


Features, Applications

The is a port-powered two-channel to RS-422 converter. It converts TD and RD RS-232 lines to balanced RS-422 signals. The unit 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. The 422PP9TB 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 The 422PP9TB 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 an RS-422 system, the 422PP9TB 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).

This product designed and manufactured in USA of domestic and imported parts by

Document No. 422PP9TB4300 - pg. 2/2 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). Refer to B&B Electronics RS-422/485 Application Note for further information on biasing.

Specifications Communication: Data Rate: Power: Dimensions: Temperature Rating:

RS-422 115.2 kbps max. Port-powered from handshake lines on the RS-232 side, to 16 VDC mA on the terminal blocks. x 1.7 cm) 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.

Manufacturer's Name: Manufacturer's Address: B&B Electronics Manufacturing Company P.O. Box 1040 707 Dayton Road Ottawa, IL 61350 USA 422PP9TB 9-Pin Port-Powered RS-422 Converter Light industrial ITE equipment EN 50082-1 (IEC 801-2, IEC 801-3, IEC EN 50081-1 (EN 55022, IEC 1000-4-2) EN ENV EN 55024



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