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Chapter 6 Networking ability. Instead of being limited to two devices, RS-485 is a multidrop interface that can have multiple d ...

Inside RS-485 Figure 6-1: An unbalanced line uses one wire per signal while a balanced line uses two wires per signal. Both type ...

Chapter 6 present more or less equally on both wires, and any noise voltage that shows up on one line is canceled by an identica ...

Inside RS-485 from Q7 into Q4, returning to the receiver via the ground wire. Line A is more positive than line B, and the resul ...

Chapter 6 :  <  RS-485 interfaces typically use a single power supply of 3.3V or 5V, but the logic levels at th ...

Inside RS-485 margin is less than on an RS-232 line, but RS-485’s differential signals cancel most noise to begin with. Also, on ...

Chapter 6 explains how to decide whether to use a termination and if so, what compo- nents to use.. In addition to a 60Ω paralle ...

Inside RS-485
 public void GetParallelInputResistance() { const Int32 receiverInputResistance = 12000; Single parallelInputRe ...

Chapter 6        In a half-duplex line, only one driver should be enabled at a time. But no mat- ter how car ...

Inside RS-485 requires limiting the current to 250 mA. If an output continues to source or sink high currents, the chip heats up ...

Chapter 6 Figure 6-6 shows a chip that contains a single RS-485 transceiver. A driver con- verts a TTL/CMOS voltage at DI to an ...

Inside RS-485         As with RS-232, you can add an RS-485 port to a PC by installing an expan- sion card or P ...

Chapter 6 drivers to Node 0’s receiver. All of the secondary nodes monitor messages from Node 0. The node being addressed replie ...

Inside RS-485 Figure 6-9 shows a half-duplex network that uses an SN75176B differential bus transceiver. When a driver’s enable ...

Chapter 6 Figure 6-9: This half-duplex RS-485 network has a single data path. All nodes must also share a gorund connection, typ ...

Inside RS-485 A single-chip solution is the MAX3162E, which contains two RS-232 drivers, two RS-232 receivers, and an independen ...

Chapter 6 RS-232’s TX is ±15V, the RS-485 receiver’s input sees a voltage of about ±5V. If the RS-232’s TX is just ±5V, the RS-4 ...

Inside RS-485 "4  $8 If a transmitting computer disables its driver by the middle of the final trans- mitted Stop ...

Chapter 6     An RS-485 port can use any of three configurations (Figure 6-13): Use two output bits and control the ...

Inside RS-485 In the PIC18F4520 and other PIC® microcontrollers, the TXSTA register’s TRMT bit indicates whether the transmit sh ...