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文檔簡介
1、HIGHT VOLTAGE SQUARE WAVE BUS DEMO KEY FEATURES Evaluation for PWBS751 and PWBS331 Host PWBS751 with RS485 interface Slave PWBS331 with RS485 interface Compatible
2、160;to RS485 directly (N,8,1 or N,9,1 with 3000m long distance ability and any network such as tree or star Supports 24,36,48V square wave BUS Delivery
3、0;20A current on 2400bps data rate Delivery 5A current on 9600bps data rate Self circuit shorting protection ability (Circuit short on the BUS Slave site &
4、#160;supports 500mA fixed voltage output, or 1A fixed voltage output, or direct DC output No need software setting DESCRIPTION This Demo can show how PWBS75
5、1 and PWBS331 work together to create a reliable communication system with DC transmission ability. It can show strong ability of 3000m long distance reliable
6、 communication, tree or star network communication, DC transmission ability, 500 slave side reliable communication ability. Please finish test as blow step by step
7、. ENGINEERING TARGET TEST GUIDE Notice Do not open any power before connect the demos well For PWBS751 1 Connect th
8、e DC input by target voltage to G and V+ terminal (Do not open the DC power 2 Connect host sides RS485 interface to demo (Maybe a computer by
9、 RS232 to RS485 adapter 3 Connect square wave BUS to P+ and P terminal by two wires (Notice the relationship between resistance and voltage drop with
10、;diameter and length. Table 1 For PWBS331 1 Connect A, B terminal to slave sides RS485 interface or to TTL by a RS485 to TTL adapter 2
11、 Connect P+, P to the square wave BUS by two wires (Notice the relationship between resistance and voltage drop with diameter and length. Table 1 3 Conn
12、ect V1 or V2 or V3 to target load (Or do not use this function Open the DC power and then evaluate below ability one by one
13、;1 RS485 network 3000m long distance communication 2 RS485 network reliable communication in tree or star topology 3 DC voltage transmission ability Notice Please notice th
14、at V1 in the PWBS331 demo is done by MC34063 which can only work under 40V. Make sure to control the square wave BUS on the slave side
15、is under 40V. But that doesnt mean host side cant input 48V because there is voltage drop when long distance between host and slave side. Make s
16、ure the BUS voltages peak value to slave side is bigger than 12V so that the PWBS331 can work well If use the DC transmission ability to po
17、wer slave device, do not need to consider isolated design for slave side. If do not use DC transmission ability, and slave side get power from local power
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