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CS485 데이터시트 PDF




ETC에서 제조한 전자 부품 CS485은 전자 산업 및 응용 분야에서
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CS485 데이터시트, 핀배열, 회로
CS485
User’s Manual
www.DataSheet4U.com
Version 2.0
© 2003 ZYPEX, Inc.




CS485 pdf, 반도체, 판매, 대치품
CS485 Configuration and Setup
4-wire Operation (J8 OUT)
4-wire operation provides full-duplex capability for point-to-point configurations. A
4-wire ‘half-duplex’ configuration is also useful where the master unit is always
transmitting to the slave units, and the slave units respond to the master in half-
duplex style. This simplifies the control software for the master, and can provide
a speed advantage over 2-wire half-duplex configurations. The slave units can
enable their transmitters using either RTS control or data control.
2-wire Dual Port Operation (J8 IN)
Multi-drop applications typically use a 2-wire configuration. Installation requires a
single twisted pair, and all nodes can talk to each other. Many applications use a
single master with multiple slaves.
The CS485 is capable of dual port 2-wire operation. If J8 is installed, the RX and
TX pairs both operate as half-duplex ports. A CS485 configured for dual-port
operation can communicate with 2 trunks of half duplex slaves. This allows the
www.DataSheet4UC.cSo4m85 to talk to 2 trunks of 31 slaves or 62 slaves total.
Carrier Detect
A feature available on the CS485 that is not available on most line drivers is the
ability to detect when a remote line driver has turned on its transmitter. This is
useful for controlling other equipment that may require carrier control like radio
modems. This signal is passed to the RS-232 port as the Data Carrier Detect
(DCD) signal.
Carrier detect works by sensing a voltage level greater than 850mV between the
RX+ and RX- wires. Built-in hysteresis prevents the DCD signal from oscillating
in noisy environments. The pull-up, pull-down and termination jumpers (J4, J3
and J2) must be installed on each end of the communication line for proper
operation. The DCD output will maintain its last state when the RTS signal is
asserted and the CS485 is used to transmit data.
Carrier detect can also be asserted based on the presence of received data. If
the DCD jumper on J10 is installed, the RS-232 DCD signal is asserted when
incoming RS-485 data is received. The DCD signal is asserted as soon as RS-
485 data is detected. Following the last character, the DCD signal is held active
for the delay time set by the Keydown Delay jumpers before being de-asserted.
The baud rate jumpers on J10 must be set to the desired baud rate.
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CS485 전자부품, 판매, 대치품
RS-485 RX and TX Jumpers
J4 – Enable pull-up resistor for RX+ line
J3 – Enable pull-down resistor for RX- line
J2 – Terminate RX pair with 120 ohm resistor
J7 – Enable pull-up resistor for the TX+ line
J6 – Enable pull-down resistor for the TX- line
J5 – Terminate TX pair with 120 ohm resistor
J8 IN Enables 2-wire operation for both RX and TX pairs
(Dual port operation)
OUT Enables 4-wire operation
RX is receive pair
TX is transmit pair
J15 Connects isolated RS-485 common to bleed resistor and filter cap
www.DataSheet4U.com
Line Termination
The CS485’s termination jumpers should only be installed if the CS485 is
physically at one end of the trunk.
To terminate the RX pair, install jumpers J2, J3 and J4.
To terminate the TX pair, install jumpers J5, J6 and J7.
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