P0911VX

描述

目前较为常用的RS232串口有9针D形串口[DB9]和25针D形串口[DB25]，最大通信距离为[15m]。两台设备的距离较近时，可以用232电缆线将它们的232串口直接相连；若距离较远，可通过调制解调器(MODEM)相连。

RS232接口——

●采用“负逻辑”——输出端用＋5V～＋15V表示[逻辑0]，-5V～-15V表示[逻辑1]。

●采用“单端驱动”——通过数据发送端[TD]输出驱动电平，并以信号地GND为参考点。

●采用“单端接收”——通过数据接收端[RD]输入接收电平，并以信号地GND为参考点。

RS232三线制——

能实现[点对点双向通信]，需要3根通信线，主方的数据发送端[TD]与从方的数据接收端[RD]相连，主方的数据接收端[RD]与从方的数据发送端[TD]相连，两方的信号地[GND]直接相连。

RS232使用注意事项——

RS232串口不能直接与RS485串口相连——因为它们的电气标准不相同；市面上提供各种串口转换器，必须通过转换器才能连接。另外，不要带电插拨串口，插拨时至少有一端是断电的，否则容易损坏串口。

欧美品牌停产的，常用的“PLC”备品备件

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​
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Woodward 5461-651 Analog Input-8 Channel 4-20 mA

Woodward 5461-652 CURRENT INPUT

Woodward 5461-653

Woodward 5461-654 8 Ch RTD/input

Woodward 5461-655

Woodward 5461-656

Woodward 5461-659 DISCREET MODULE

Woodward 5461-661 Current Output Isolated-507(8 Channel)

Woodward 5461-768 Speed Control

Woodward 5461-769 Speed Reference

Woodward 5461-770 Speed Control

Woodward 5461-771 Speed Reference

Woodward 5461-772 Temp Control

Woodward 5461-773 SW Mode

Woodward 5461-774 Freq.Control

Woodward 5461-775 Amb.Bias Ramp

Woodward 5461-776 Accel.Schedule

Woodward 5461-777 Decel.Jump Rate

Woodward 5461-778 Liq.Final Driver

Woodward 5461-779 Fuel Transfer Card/Board

Woodward 5461-780 Gas Final Driver

Woodward 5461-781 Synchonizer

Woodward 5461-798 N1 Speed Control

Woodward 5461-880 RTD

Woodward 5461-892

Woodward 5461-944 Speed Control

Woodward 5461-975 Power Supply DCS 2 LV

Woodward 5461-975 Power Supply DCS 2 LV

Woodward 5462-017 DCS DIGITAL SPD SENSOR

Woodward 5462-085 FINAL DRIVER

Woodward 5462-117 POS TRANSDUCER

Woodward 5462-236

Woodward 5462-244 Liq.Final Driver

Woodward 5462-268 Mother Board for 505

Woodward 5462-292 Speed Sensor

Woodward 5462-336 Speed SENSOR

Woodward 5462-338 Power Aux Card

Woodward 5462-443 Fuel Transfer Card/Board

Woodward 5462-472

Woodward 5462-482

Woodward 5462-518 Speed SENSOR

Woodward 5462-519 Speed Control

Woodward 5462-520 Speed Reference

Woodward 5462-521 Power Sensor

Woodward 5462-522 Power Control

Woodward 5462-523 Power Refernce

Woodward 5462-524 Extraction Control

Woodward 5462-525 Pressure Prefernce

Woodward 5462-526 Ratio Limiter

Woodward 5462-527 Valve Ramp

Woodward 5462-528 Final Driver

Woodward 5462-529 Valve Ramp

Woodward 5462-530 Final Driver

Woodward 5462-531 Auxiliary

Woodward 5462-532 Pressure Channel

Woodward 5462-533 Power Prefernce

Woodward 5462-578 High Volt P/S

Woodward 5462-581

Woodward 5462-584 DCS Motherboard

Woodward 5462-651 ANALOG 8CH 4-20MA INPUT

Woodward 5462-718 SPEED SENSOR

Woodward 5462-749 COPROCESSOR

Woodward 5462-750 SEC.POWER SUPPLY

Woodward 5462-753

Woodward 5462-756

Woodward 5462-757 DISCRETE INPUT

Woodward 5462-758 DISCRETE OUTPUT

Woodward 5462-762 SIO Card

Woodward 5462-893 CPU Card

Woodward 5462-896

Woodward 5462-916 FTC-DCS II

Woodward 5462-917

Woodward 5462-944 DPS3/DT

Woodward 5462-948 T/C Card-8 Channel

Woodward 5462-966 Speed Sensor/Analog In

Woodward 5463-033

Woodward 5463-034 POWER AUX.N.C.

Woodward 5463-089 CPU

Woodward 5463-120 cpu module

Woodward 5463-124 Sio

Woodward 5463-127 SIO

Woodward 5463-140 Master CPU

Woodward 5463-141 Master CO CPU

Woodward 5463-143 Aux Memory

Woodward 5463-154 MODULE ASSY-509 DISCREET I/O

Woodward 5463-178 CPU Card

Woodward 5463-190

Woodward 5463-191

Woodward 5463-193

Woodward 5463-306 CPU Interface

Woodward 5463-306 Interface Module

Woodward 5463-338 RTD Input

Woodward 5463-372 FINAL DRVR

Woodward 5463-373 Analog Input Position Fdbk

Woodward 5463-375 Analog Input Position Fdbk

Woodward 5463-384 Analog Output

Woodward 5463-388 8CH RTD A/I