|Category||Interface and Interconnect => Line Drivers|
|Datasheet||Download 422LP9N datasheet
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 is powered from the RS-232 handshake lines DTR and RTS. One of these handshake lines must be asserted (high) in order to power the unit (See Table 1). The RS-422 driver is enabled when RTS is asserted. Therefore, RTS must be asserted in order to transmit data. The RS422 receiver is always enabled. If DTR is always asserted and the RTS is used to control the driver, the 422LP9N can be used RS-485 4-wire converter. To insure reception, it is recommended that DTR is asserted. In order to maximize the amount of power available to the RS-422 driver, the RS-232 handshake lines are not looped back (tied together). As a result the following handshake lines will appear as disasserted (low): CTS, DCD, and DSR. Care should be taken to insure that any software being used doesn't require any of these handshake lines be asserted. If existing software requires any of the handshake lines to be asserted, you can loop back the required handshake lines in your cable.Table 1 DTR Functions Possible (when port-powering unit) State
Low High Low High none Receive Transmit, Receive Transmit, Receive
* NOTE: Low = disasserted and High = asserted Connections The 422LP9N can be connected in three different types of systems: RS-422 (Figure 1), four-wire RS-485 (Figure 1), and two-wire RS-485 (Figure 2). Regardless of the system, the 422LP9N must be connected with the proper polarity. With no data is being sent and the driver enabled, the RS-232 line should be negative and the TD(A) should be negative with respect to TD(B). Proper operation of any RS-422 system requires the presence of a signal return path between the signal grounds of the equipment at each end of an interconnection. This circuit reference may be established by a third conductor connecting the common leads of devices, or it may be provided by connections in each equipment to an earth reference. When the circuit reference is provided by a third conductor, the connection between the signal grounds and the third conductor should contain some resistance (e.g. 100 ohms) to limit circulating currents when other ground connections are provided for safety.This product designed and manufactured in USA of domestic and imported parts by
Transmit Data A Transmit Data B Receive Data A Receive Data B Signal Ground
Biasing Resistors The biasing resistors for the RS-422/RS-485 receiver are 4.7K Ohm resistors. These resistors are labeled R1 and R6 (See Figure 3). Refer to B&B Electronics RS-422/485 Application Note for further information on biasing. Figure 3
Specifications Data Rate: 115.2K Baud max. Power: Port-Powered from RTS and DTR. NOTE: If external power is required, apply power to DTR (4) and SG (5). Source must supply greater than 6VDC and current limited to 40mA
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 422LP9N 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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