串行连接暂停导致一个RTU设备暂停的唯–原因是当一个信息正在被接收时发生–个四字符周期的数据流中断。如果这种情况发生，认为该信息被终止并且不再向主设备发送响应。有几个由应该被主设备重视的从设备的特征引起的时序因素。在发送一一个查询信息后，在从设备不响应请求之前，主设备应该为从设备翻转等待–个适当的时间。从设备翻转时间受控制器通讯窗口时间和CPU扫描时间的影响。正如13-24页关于RTU的描述。

Industrial Nozzle Tip EMI 5 1/4 x 1 1/2 #22440

Industrial Nozzle Tip 11.25″ long #25008

Industrial Nozzle Tip 2.25″ Nozzle Length #26823

Flowserve Pump Shaft Seal 5NC15 * IN BOX* #13647

Allen Bradley 702-COD3 Starter #12197

EMI Nozzle Tip 39441, 8 2″ Thread, 5 3/8″ #26822

Allen Bradley Pushbutton 800T-QTH24A Series T #22074

MRC Double Row Ball Bearing 5307CZZ ** #12488

Hubbell Killark V Series Green Glass Globe VGG-100

SCI PC Board 080-4000-1, REV B 180-4000 #31285

SCI PC Board 080-4000-1, REV C 180-4000 #31281

SCI PC Board 080-4000 REV B, 180-4000 REV O #31283

SCI PC Board 080-4000 REV D, 180-4000 REV C #31282

Telemecanique Safety Switch XCK J7910H7 #11166

SCI Circuit Board 080-4000L #29825

SCI Circuit Board 080-4000 Rev B, 180-4000 REV B #31284

SCI 080-4000 Quad AC Output Card Circuit Board #7184

SCI 080-4002 Quad 12 VDC Input Card #7185

SCI Circuit Board 080-4002, 180-4002 REV A #33164

SCI Circuit Board 080-4000-1 Rev B / I #31561

Oriental Motor Vexta Stepper PK266-01A, 2 Phase #21914