B&B Electronics 485SD9R
Contents
1. ATA 4 oro GND GND Figure 1 E www bb elec com orders bb elec com support bb elec com International Office 707 Dayton Road PO Box 1040 Ottawa IL 61350 USA 815 433 5100 Fax 433 5104 BsB ELECTRONICS European Office Westlink Commercial Park Oranmore Co Galway Ireland 353 91 792444 Fax 353 91 792445 B amp B ELECTRONICS PRODUCT INFORMATION Table 1 485SD9R Pin Outs DB 9S Pin 2o PB or7 4 ore6 P 9146_485SD9R 081 2 2 2 roy Y RS 485 DB 9 FEMALE R1 4 K FOV O Y13 14 I J23 P DATA g 5y l ofe 2 7 RS 232 T gt o 5 i J2 RO O FE F O S a o DB9 9 FEMAI U3 Ye if DE U2 ae ce DATA 7 1 o On P J1 5 R 2 id 7 me pG 3 o lt I Ro E S G GND 47K e 2 6 Jey gt o R4 L jg D312 9 4 7K 5 g TO ALL 5V 0 c4 L i at i E ale oe 10 NEGATIVE TO POSITIVE r A VOLTAGE INVER 1N5231 1 2 DECLARATION OF CONFORMITY Manufacturer s Name B amp B Electronics Manufacturing Company Manufacturer s Address P O Box 1040 707 Dayton Road Ottawa IL 61350 USA Model Numbers 485SD9R Description Port powered RS 232 to RS 485 Data Converter Type Light industrial ITE equipment Application of Council Directive 89 336 EEC St2. B amp B ELECTRONICS PRODUCT INFORMATION P 9146_485SD9R 0812 1 2 Model 485SD9R Port Powered RS 485 Converter CE The 485SD9R is a port powered two channel RS 232 to RS 485 converter It converts TD and RD RS 232 lines to balanced half duplex RS 485 signals The unit is powered from the RS 232 data and handshake lines whether the lines are high or low The 485SD9R has DB 9 female connectors on both the RS 232 side and the RS 485 side RS 232 Side Connector DB 9 female Signals Passes through pins 3 TD and 2 RD Pins 7 RTS and 8 CTS are tied together Pins 4 DTR 6 DSR and 1 CD are tied together RS 485 Side Connector DB 9 female Signals 2 wire half duplex operation only Automatic control circuit enables driver only when transmitting Receiver is disabled when transmitting to prevent echo back to RS 232 device Data Rates Up to 115 2 k baud Distance Depending on power from port will transmit up to 4000 feet at 19 200 baud Dimensions 2 50 x 1 30 x 80 in Power Requirements No external power is required if two RS 232 output handshake lines are available If the handshake lines are raised and no termination is used the power efficiency is greatly increased Less than 3mA is required to operate the 485SD9R plus the load current NOTE 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 line
3. andards EN 55022 EN 61000 6 1 EN 61000 4 2 4 3 4 4 4 5 4 6 4 8 4 11 Robert M Paratore Director of Engineering C B www bb elec com orders bb elec com support bb elec com International Office 707 Dayton Road PO Box 1040 Ottawa IL 61350 USA 815 433 5100 Fax 433 5104 BSB ELEC TRONICS European Office Westlink Commercial Park Oranmore Co Galway Ireland 353 91 792444 Fax 353 91 792445
4. s Operation Although the 485SD9R uses handshake lines to power the converter no handshaking is required to control the RS 485 driver The RS 485 driver is automatically enabled during each spacing state on the RS 232 side During the marking or idle state the RS 485 driver is disabled and the data lines are held in the marking state by the 4 7K ohm pull up and pull down resistors The value of these resistors may need to be changed to a different value when termination is used in order to maintain the proper DC bias during the idle state See B amp B Electronics free RS 422 RS 485 Application Note for more information on termination and DC biasing of an RS 485 network Some users may see an echoed character string on their RS 232 side This is due to the low power operation of the DS1275 chip The DS1275 uses the lesser value of ground or negative input voltage into the receiver for the driver s negative rail When transmitting into this device its RS 232 output may swing between the negative input and ground as the receiver input voltage goes negative and positive Therefore if your receiver interprets ground as a space or high level you may see an echoed character string on the RS 232 side If this is not acceptable for your application you may want to choose one of our externally powered units similar to the 485PTBR 4695D9K 2 wire RS 485 2 oro DATA A DATA 2 Or 7 DATA B 4 D
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