BB-422LP9R Port-powered RS-232 to RS-422 Converter Features Converts RS-232 TD and RD to balanced RS-422 signals Extends data up to 1.2 km (4000 ft) Data rate: up to 115.2 kbps baud Port-powered from RS-232 handshake lines (DTR, RTS) Inline installation 4.7K Ohm biasing resistors FCC, CE certifications Introduction Ordering Information Model BB-422LP9R is a port-powered, two-channel RS-232 to RS-422 converter. It Model No. RS-232 Connector RS-422 Connector Power 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. RS-232 Handshake BB-422LP9R DB9 Female DB9 Female Lines DTR & RTS Do You Need An Externally Powered Converter Accessories Sold Separately If you need an externally powered converter, Model BB-4WSD9R is a suitable option. BB-9PAMF6 - Serial Cable, DB9M to DB9F, 1.8 meters ( 6 ft) Specifications Mechanical Diagram Serial Technology Units - cm/in Data Rate Up to 115.2 Kbps baud RS-232 Connector DB9 female 3.18 cm 1.59 cm RS-422 Connector DB9 female 1.25 in 0.63 in Biasing Resistors 4.7k Ohms Power Source Port-powered from RS-232 handshake lines Mechanical Dimensions 6.2 x 3.3 x 1.1 cm (2.4 x 1.3 x 0.43 in) Enclosure Plastic Weight 81.6 g (0.18 lb) 6.03 cm Environmental 2.38 in Operating Temperature 0 to +70 C (+32 to +158 F) Storage Temperature 40 to +85 C (-40 to +185 F) 5.23 cm Operating Humidity 0 to 95%, non-condensing 2.06 in Meantime Between Failures (MTBF) MTBF 3020199 hours Calculation Method MIL 217F Parts Count Reliability Prediction Regulatory Approvals / Standards / Directives FCC, CE 2014/30/EU - Electromagnetic Compatibility Directive (EMC) 2011/65/EU - Amended by (EU) 2015/863 Reduction of Hazardous CE Directives Substances Directive (RoHS) 2012/19/EU - Waste Electrical and Electronic Equipment (WEEE) EN 55032 Class A - Electromagnetic Compatibility of Multimedia Equipment - Emission Requirements EN 55024 - Information Technology Equipment - Immunity CE Standards Characteristics - Limits and Methods of Measurement EN 61000-6-1 - Generic Immunity Standard for Industrial Environments BB-USOPTL4-2P BB-USOPTL4-4P 0221ds All product specifications are subject to change without notice. BB-422LP9R 1821dsBB-422LP9R Operation Tips Table 2. Pin-outs Model BB-422LP9R is powered from the RS-232 handshake lines DTR and RTS. One of Signal DB9S Pin 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. RTS must be asserted in order to transmit Transmit Data A (-) 8 data. The RS-422 receiver is always enabled. If DTR is always asserted and RTS is used Transmit Data B (+) 3 to control the driver, Model BB-422LP9R can be used as an RS-232 to RS-485 4-wire Receive Data A (-) 2 converter. To ensure reception, it is recommended that DTR is asserted. Receive Data B (+) 7 In order to maximize the amount of power available to the RS-422 driver, the RS-232 Signal Ground 4, 6 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 ensure that any software being used does not require any of these handshake lines to 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. Biasing Resistors Table 1. Handshake Lines & Port-Powering The RS-422/RS-485 receiver biasing resistors are 4.7K Ohm resistors. The resistors are Functions Possible RTS State DTR State labeled R1 and R6 (see Figure 3). Refer to Advantechs RS-422/485 Application Note for (when using port-power) more information on biasing (available on website). Low Low None Low High Receive Data High Low Transmit Data High High Transmit Data * NOTE: Low = disasserted and High = asserted Connections Model BB-422LP9R 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, Model BB-422LP9R 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 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 piece of 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.