1N Connections Using RS-422A/485 Ports | Omron CQM1H-SCB41 manual

Application Procedure							Section	4-3
			1:N Connections Using RS-422A/485 Ports
					3G2A9-AL001 Link Adapter		Serial Communications
					3G2A9-AL001 Link Adapter		Board
Computer		NT-AL001-E Link Adapter				Shield
Computer					Pin Signal	Shield
					Pin Signal	Signal Pin	Pin Signal
	Signal	Pin	Signal	Signal Pin
	FG	Shield	NC			RS-422A/	RS-422A/
	FG		NC			RS-422A/	485 Inter-
	SD		SD			485 Inter-	face
RS-232C	RD		RD			face
Interface	RTS		RTS				Hood
	CTS		CTS				Terminating resistance OFF
	DSR		5V		Signal		4-wire
	DSR		DSR		Pin		D-sub, 9-pin
	DTR		DTR				D-sub, 9-pin
	DTR		DTR				connector (male)
	SG		SG				connector (male)
	SG		SG
		D-sub, 9-pin		Terminal block			Serial Communications
5-V (+)		connector (male)					Serial Communications
5-V (+)							Board
power (–)							Board
power (–)						Shield Pin Signal
		DIP Switch Settings				Shield Pin Signal
		DIP Switch Settings
		Pin 1: ON					RS-422A/
		Pin 2: ON					RS-422A/
		Pin 2: ON					485 Inter-
		(terminating resistance)					485 Inter-
		(terminating resistance)					face
		Pin 3: OFF					face
		Pin 3: OFF					Hood
		Pin 4: OFF					Hood
		Pin 5: OFF					Terminating resistance ON
		Pin 6: OFF					(last node)
							4-wire
						Serial Communications
						Board
Computer		NT-AL001-E Link Adapter				RS-422A Pin
	Signal	Shield	Pin Signal		Signal Pin	RS-422A Pin	Signal
	Signal	RS-232C	Pin Signal		Signal Pin		RS-422A/
	FG		NC				485 Inter-
	SD		SD				face
RS-232C	RD		RD
Interface	RTS		RTS			Hood
	CTS		CTS			Terminating resistance OFF
			5V			4-wire
	DSR		DSR
	DTR		DTR
	SG		SG
		D-sub, 9-pin			Terminal block	Serial Communications
5-V (+)		connector (male)				Serial Communications
		connector (male)				Board
						Board
power (–)						Pin	Signal
						Pin	Signal
		DIP Switch Settings					RS-422A/
		Pin 1: ON					485 Inter-
		Pin 2: ON					face
		(terminating resistance)				Hood
		Pin 3: OFF				Hood
		Pin 4: OFF				Terminating resistance ON
		Pin 5: OFF				(last node)
		Pin 6: OFF				4-wire

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Omron CQM1H-SCB41 operation manual 1N Connections Using RS-422A/485 Ports

Contents

Sysmac CQM1H Series Serial Communications Board  Omron Omron Product References About this Manual Name Cat. No Contents Table of Contents Communications for 11 Data Links 107 Precautions Safety Precautions General PrecautionsIntended Audience Application Precautions Operating Environment Precautions Xiv Conformance to EC Directives Conformance to EC DirectivesApplicable Directives Concepts Recommended Mounting Method Recommended Ferrite Cores Section Serial Communications Boards FeaturesOverview Model Number System Configuration Mounting Location Protocol Overview Slave-initiated Communications Host Link ModeSending C-mode Host Link Commands Protocol Macros 4 PC 11 Data Links No-protocol Communications NT Links -- 11 Mode NT Links -- 1N Mode Serial Communications Board SpecificationsBasic Operating Procedure General Specifications Board Components and Installation Component Names and Functions IndicatorsBoard Indicators Indicator Color Status Meaning Connector Pin Layout CPU Unit Indicators2 RS-232C Port Recommended Cables Applicable ConnectorsTions method Wire Wire, 1N Synchroniza 3 RS-422A/485 Port Terminating Resistance Switch Wire or 4-Wire Switch SwitchesLabel Name Settings Factory setting Mounting the Board Installation Mounting Height and Connector Cover Dimensions External Dimensions Precautions in Handling the Board Recommended Cables RS-232C Cables WiringConnectors Standard Connectors For Both RS-232C RS-422A/485 Reducing Electrical Noise for External Wiring Wiring PrecautionsRS-422A/485 Cable WiringSection Pin Function Factory Setting Recommended RS-232C Wiring Examples Model Manufacturer CO-HC-ESV-3Px7/0.2 Hirakawa Hewtech Corp Recommended RS-422A/485 Wiring ExamplesWire Connections Recommended RS-422A/485 Cable Using an NT-AL001-E RS-232C/RS-422 Link Adapter Using a 3G2A9-AL001 Link AdapterLength Model Cable Preparation Wiring ConnectorsShield Connected to Hood FG Shield Not Connected to Hood FG Soldering Assembling Connector Hood Connecting to the Board Default Settings and Related Bits/Flags Contents Addresses PC Setup Settings Words Bits Function Applicable Mode Word Bits Function Communications Modes Control Bits, Flags, and Status Information 00 to Port Slot 1 Inner Board Error Code Hex Word Bits Function Inner Board Error Flag Host Link Communications TXD-- Instruction Host Link Communications Host Link Communications Serial communications Features ModeSimultaneous Usage of Both Ports Host Link Specifications Application Procedure Port Bits Default Function Setting PC-initiated Communications TXD-- Instruction Host-initiated Communications Host Link Commands Connection Examples Port Configura Schematic diagram Tion RS-232CConnections Types of Connection RTS RS-232C Using NT-AL001-E Converting Link Adapters 1N Connections Using RS-232C Ports Connections Using RS-422A/485 Ports 1N Connections Using RS-422A/485 Ports Preparing an RS-232C Cable for the Computer Standard Cables from Board to Personal ComputerBoard port Computer Network type Model Length Remarks Port Normal Response Frame ProtocolFormat FCS Frame Check Sequence Error Response Frame Format Computer Communications Sequence Example Programs Using the TXD-- InstructionExample Program for TXD-- Application Example Communications Control Signals Communications Timing Setting a Transmission Delay Header code PC mode Name Host Link Commands End Codes End Contents Probable cause Corrective measures Code RS-232C Ports Changes from Previous Products Full-duplex transmissions that do not use Half-duplex transmissions that use CD 2 RS-422A/485 Ports Protocol Macros Overview of the Protocol Macro Functions Protocol Macro Function Specifications Parameters Response Sequence contents Number of stepsStep common Per sequence Parameters Transmission Control Retry count Step contents CommandsError processing Repeat counter Utes of ad Vari Description Message con ConTents Header Stant Terminator Data attrib Utes Con Data attrib Stant Using the Standard System Protocols Using the Protocol Macro FunctionBe traced SEND&RECEIVE Modifying Standard System Protocols Restriction Procedure Restrictions in Using the CX-ProtocolStorage Memory Select Transfer to PLC via Online or Port Bits Setting Function Using Standard System Protocols Send Data Using User-created ProtocolsReceive Data Transferring the created project to the Board Port Configuration Schematic diagram Connecting RS-232C Ports Connections to E5CK Controller Connections to a Modem DIP SW 485 RS-422A Terface Hood 3G2A9-AL001 Receive Protocol Structure Parameter Meaning Sequence Parameters Step Parameters Level Setting Level Possible changes in settings Port 1 Protocol Macro Execution Error Flag Board Identification Error Flag hardware errorProtocol Data Error Flag Port 2 Protocol Macro Execution Error Flag Port 1 Sequence Abort Completion Flag Word Bits Name and Function Classifi Set Reset CationPort 1 Communications Error Flag Port 2 Communications Error Flag Port 1 Executed Reception Case No. code Port 1 Protocol Macro Error CodePort 2 Protocol Macro Error Code Port 2 Tracing Flag Port 1 Shot Trace Start/Stop Bit Port 2 Restart BitPort 1 Continuous Trace Start/Stop Bit Port 2 Continuous Trace Start/Stop Bit Port 1 Forced Abort Bit Port 1 Transfer Step Error Processing FlagPort 2 Transfer Step Error Processing Flag Port 1 Sequence END Completion Flag Executing Communications Sequences Using Protocol MacrosPMCR-- Instruction Specifications Error Codes PMCR-- Operation FlagsFirst Receive Data Storage Word D Operand Areas and Address Ranges Ladder Program StructureProgramming Example Receive Word Allocation for Sequence No Present Value Read Ladder Program ExampleConnections Send Word Allocation for Sequence No Present Value Read Operand Settings for the PMCR-- Instruction Ladder Programming Example Precaution on Reception Failures for Pmcr Transmission Methods Time Lag t1 Error Flags for Overrun, Framing, and Parity ErrorsBaud rate b/s Lag time ms Processing When a Sequence Ends Abnormally Example Precautions on Using the Force Abort Bit No-protocol Communications Specification No-protocol Specifications Start code End code Yes Send/Receive Message Frames 100 Connecting to a Bar Code Reader via RS-232C Control Word C Using No-protocol CommunicationsTransmit TXD-- in No-protocol Mode Transmit TXD-- and Receive RXD Receive RXD-- in No-protocol Mode RXD-- Communications Procedure TXD-- Communications Procedure Conditions PC SettingsComputer Settings Application Example Communications for 11 Data Links OverviewSection PC Setup SettingPort Bits Function Setting Starting Data Links Specifications Overview Conditions Using 11 Data LinksMaster PC Settings Slave PC Settings NT Link Communications Overview of NT Links NT Links 1N ModeNT Links 11 Mode Precautions 115 NT Link Settings for 11 Mode NT Link Settings for 1N Mode 117 118 Troubleshooting and Maintenance Indicators Possible cause Remedy Board CPU Unit Front-panel Indicator Error Displays Board Error Information TroubleshootingSerial Communications 122 123 124 Board ReplacementSection 126 Not perform Error Indicator Error details Cause Remedy Code 128 3 1N NT Link Mode Cleaning Cleaning and Inspection Inspection Items InspectionMaterials Required Daily Materials Required Occasionally Settings after Replacing the Board Board ReplacementReplacement Procedure Protocol Macros Designed with CX-Protocol Example Using Standard System ProtocolsProcedure Introduction Receive Data Word Allocation 4th Operand Standard System ProtocolsProtocol name Function CompoWay/F Master Protocol System Configuration for Standard System ProtocolCompoWay/F Command Format Communications SpecificationsTransmission Procedure Command and Response Formats Response Frame Contents Command Frame ContentsAppendix B End code Name Meaning Command FrameCommand Data contents Code Example Response Text Command and TextVariable type Contents Example Variable Area Read Structure of the Protocol CompoWay/F Master Protocol Sequences Send with Ascii Conversion, with Response Sequence No CompoWay/F Message Frames and PMCR260 OperandsResponse Frame Receive Data Word Allocation 3rd Operand of PMCR260 Send Data Word Allocation 2nd Operand of PMCR260 145 Broadcast with Ascii Conversion, No Response Sequence No Send with No Conversion and with Response Sequence No Broadcast with No Conversion and No Response Sequence No 149 150 RS-232C Connections RS-485 2-wire Connections RS-422 4-wire Connections E5jK Digital Controller Read Protocol Appendix C RS-232C Connection Connection ConfigurationRS-485 Connection Send Data Word Allocation 2nd Operand of Pmcr Read Process Value Sequence NoRead Set Point during SP Ramp Sequence No Appendix C Read MV Sequence No Read Alarm Value Sequence NoRead Set Point Sequence No Read Cooling Coefficient Sequence No Read Dead Band Sequence No Read Manual Reset Value Sequence No Read Control Period Sequence No Read Hysteresis Sequence NoRead SP Ramp Time Unit and Set Value Sequence No Read LBA Detection Time Sequence No Read MV Limits Sequence No Read MV at Stop Time and at PV Error Sequence No.013 Read Input Digital Filter Sequence No Read Alarm Hysteresis Sequence NoRead Input Shift Limits Sequence No Read Level 0 Parameters Sequence No Read Level 1 Parameters 1 Sequence No Read Level 1 Parameters 2 Sequence No 166 Read Level 2 Parameters 1 Sequence No Read Level 2 Parameters 2 Sequence No 169 General-purpose Read Sequence No E5jK Digital Controller Write Protocol Appendix D Write Set Point Sequence No Write Alarm Value Sequence No Write Hysteresis Sequence No Write Manual Reset Value Sequence NoWrite Cooling Coefficient Sequence No Write Dead Band Sequence No Write SP Ramp Time Unit and Set Value Sequence No Write Control Period Sequence NoAppendix D Write LBA Detection Time Sequence No Write MV at Stop Time and at PV Error Sequence NoWrite MV Limits Sequence No Write Input Digital Filter Sequence No Write Alarm Hysteresis Sequence NoWrite Input Shift Value Sequence No Write Level 0 Parameters Sequence No Write Level 1 Parameters 1 Sequence No Write Level 1 Parameter 2 Sequence No Write Level 2 Parameters 1 Sequence No Write Level 2 Parameters 2 Sequence No General-purpose Write Sequence No Switch to Level 0 Software Reset Sequence No Remote/Local Sequence No Run/Stop Sequence No Execute/Cancel AT Sequence No Software Reset Sequence No Switch to Level 1 Sequence No Appendix E E5ZE Temperature Controller Read Protocol RS-232C Connections Signal name Signal direction Pin No Brevi Ation RS422/485 Connections RS-485 Pin No Signal name Abbreviation Signal direction RS-422A Appendix E Baud Rate DIP Switch Switch SettingsCommunications Parameter DIP Switch Unit Number Switch 192 Read Output Values Sequence No Read Set Point, Process Value, and Output Value Sequence No 195 196 Read Alarm Mode Sequence No Read Output Mode Sequence No Read Alarm Temperatures Sequence No Read Operation Status Sequence No Read Setting Unit Sequence No Read Error Status Sequence No Read Input Shift Value Sequence No Read Ramp Value Sequence No Read Output Value Limit Sequence No Read Present Set Point Sequence No Read Output Value Change Rate Limit Sequence No Read HB Alarm and HS Alarm Valid Channels Sequence No Read Heater Current and SSR Leakage Current Sequence No.121 Read Dead Band/Overlap Band Sequence No 208 Appendix F E5ZE Temperature Controller Write Protocol Write Set Point Setting Unit 1 Sequence No Write Set Point Setting Unit 0.1 Sequence No 212 213 Write Alarm Mode Sequence No Write Output Mode Sequence No Write Alarm Temperature Setting Unit 1 Sequence No Write Alarm Temperature Setting Unit 0.1 Sequence No Start Autotuning Sequence No Write Setting Unit Sequence No Cancel Autotuning Sequence No Appendix F Write Manual Output Value Sequence No Write Ramp Value Sequence No Write Output Value Limit Sequence No Write Output Value Change Rate Limit Sequence No Initialize Settings Sequence No Save Settings Sequence No Write HB and HS Alarm Valid Channels Sequence No Write Dead Band/Overlap Band Sequence No Stop Operation or Control Sequence No Start Control Sequence No Start Manual Operation Sequence No Appendix G E5jJ Temperature Controller Protocol RS422A/485 Connections Signal name Abbreviation Signal direction Pin No Appendix G Input Signal ground Select RAM Write Mode Sequence No Select Remote Mode Sequence NoSelect Local Mode Sequence No Select Backup Mode Sequence No Write Parameters 1 Sequence No Save Set Point Sequence No Write Parameters 2 Sequence No 235 Read Parameters 1 Sequence No Read Parameters 2 Sequence No 238 Read Set Point Limit Sequence No Read Output Value Sequence No Read Initial Status Sequence No Read Heater Current Sequence No 241 242 ES100j Digital Controller Protocol Appendix H Appendix H RS-422A/485 Connections Appendix H Read Event Data Sequence No Read Time Signal Sequence No Read Error Detection Data Sequence No 249 Read Heater Burnout Data Sequence No Read PV Data Sequence No Read SP Data Sequence No Read MV Data Sequence No Read Control Monitor Data Sequence No 255 Read Adjustment Parameters Sequence No 257 258 Write Adjustment Parameters Sequence No Read PID Control Parameters 1 Sequence No 261 Read PID Control Parameters 2 Sequence No 263 Write PID Control Parameters 1 Sequence No 265 Write PID Control Parameters 2 Sequence No Read Local SP Sequence No 268 Write Local SP Sequence No Read Program Parameters Sequence No 271 Write Program Parameters Sequence No Remote Setting Mode Sequence No External Setting Mode Sequence No Local Setting Mode Sequence No Run Command Sequence No Auto Mode Sequence No Reset Stop Sequence No Execute A.T. Sequence No Manual Mode Sequence No Cancel A.T. Sequence No Change Bank No. Sequence No Change Pattern No. Sequence No Read Controller Status Sequence No General-purpose Command Sequence No 282 Protocol Configuration K3Tj Intelligent Signal Processor Protocol Send word Receive word Allocation Ladder Interface SettingsAppendix Sequence Communications Function Ladder interface Signal name Abbreviation Pin No Direction K3T j Intelligent Signal Processor Protocol Inverting output Input or output Non-inverting output Signal name Abbreviation Signal direction Terminal Reset Control Continuous Units Sequence No Reset by Unit Number Sequence No 289 Write Set Value with Bank by Unit Number Sequence No Write Set Value H Continuous Units Sequence NoWrite Set Value L Continuous Units Sequence No Write Set Value LL Continuous Units Sequence No Write Set Value HH with Bank Continuous Units Sequence No Write Set Value O5 with Bank Continuous Units Sequence No Write Set Value H with Bank Continuous Units Sequence NoWrite Set Value L with Bank Continuous Units Sequence No Write Set Value LL with Bank Continuous Units Sequence No Write Set Value O1 with Bank Continuous Units Sequence No Write Set Value O2 with Bank Continuous Units Sequence NoRead Set Value by Unit Number Sequence No Read Set Value LL Continuous Units Sequence No Read Set Value HH Continuous Units Sequence NoRead Set Value H Continuous Units Sequence No Read Set Value L Continuous Units Sequence No Read Set Value with Bank by Unit Number Sequence No Read Set Value LL with Bank Continuous Units Sequence No Read Set Value HH with Bank Continuous Units Sequence NoRead Set Value H with Bank Continuous Units Sequence No Read Set Value L with Bank Continuous Units Sequence No Read Holding Data Sequence No Read Set Value O3 with Bank Continuous Units Sequence NoRead Set Value O2 with Bank Continuous Units Sequence No Read Set Value O1 with Bank Continuous Units Sequence No Read Holding Data PH Continuous Units Sequence No Read Holding Data BH Continuous Units Sequence No Offset Contents DataRead Display Value PV by Unit Number Sequence No 300 Model Data Read by Unit Number Sequence No Read Display Value PV Continuous Units Sequence No Model Data Read Continuous Units Sequence No 303 V500/V520 Bar Code Reader Protocol Appendix J Appendix J V520 Connections V500 Connections V520-R121 System SettingV500-C11 BCR Functions Host Interface Complete Data Read Sequence No BCR Read Start Sequence NoBCR Read Stop Sequence No Data Read Sequence No CODE93 BCR Function Write V500 Sequence No BCR Function Read V500 Sequence No Log Data Output Request V500 Sequence No BCR Connection Confirmation V500 Sequence No Preset Data Set V500 Sequence No BCR Initialize V500 Sequence No Log Data Clear V500 Sequence NoData Continuous Read Scan V500 Sequence No Data Continuous Read Interrupt V500 Sequence No General-purpose Command 2 Sequence No General-purpose Command 1 Sequence NoData Continuous Read Interrupt V520 Sequence No Receive Data Storage Word Allocation 3rd Operand of Pmcr Appendix J 3Z4L Laser Micrometer Protocol Appendix K Appendix K 319 Setting Status DIP Switch Settings3Z4L-3000 Series DIP Switch 3Z4L-4000 Series DIP Switch 3Z4L-3000 Series Delimiter Control Code Setting 3Z4L-4000 Series 322 Mm Unit Set Sequence No Memory Switch Set Sequence NoOffset Contents Data Data format Series 3Z4L Clear Sequence No Calibration Release Sequence No Calibration Set Sequence No Measurement Condition Set 3000-series Sequence No Program Number Set 3000-series Sequence No 326 327 Measurement Condition List Request 3000-series Sequence No Measurement Condition Release 3000-series Sequence No 329 330 Zero Run Measurement Start 3000-series Sequence No Single Run Measurement Start 3000-series Sequence NoContinuous Measurement Start Scan 3000-series Sequence No Data Request 3000-series Sequence No Measurement Termination 3000-series Sequence NoStatistic Processing Execution 3000-series Sequence No Statistic Result Request 3000-series Sequence No Statistic Processing Non-execution 3000-series Sequence NoAll Statistic Memory Clear 3000-series Sequence No Statistic Processing Memory Clear 3000-series Sequence No Appendix K Offset Contents Data Data format Memory Switch Set 1 3000-series, High-speed Type Sequence No Memory Switch Set 2 3000-series, High-speed Type Sequence No 337 338 3Z4L Initialize 3000-series Sequence No Measurement Condition Set 4000-series Sequence No 341 Measurement Condition List Request 4000-series Sequence No Measurement Condition Release 4000-series Sequence No Single Run Measurement Start 4000-series Sequence No Continuous Measurement Start Scan 4000-series Sequence No Deflection Measurement Start 4000-series Sequence No Forced Negative Zero 4000-series Sequence No Continuous Measurement Termination 4000-series Sequence NoData Request 4000-series Sequence No Forced Positive Zero 4000-series Sequence No General-purpose Command 1 4000-series Sequence No General-purpose Command 2 4000-series Sequence No Visual Inspection System Protocol Appendix L Appendix L For RS/CS Flow Control Pin No Signal name Abbreviation Measurement Execution F200 Sequence No Offset Content data format DataContinuous Measurement Execution Scan F200 Sequence No Continuous Measurement Execution Interrupt F200 Sequence No Reference Object Registration Criterion F200 Sequence No Reference Object Registration Group F200 Sequence NoEvaluation Condition Change F200 Sequence No Arbitrary Measurement Value Acquisition F200 Sequence No Measurement Execution F300 Sequence No Continuous Measurement Execution Scan F300 Sequence No 358 Continuous Measurement Execution Interrupt F300 Sequence No 360 Measurement Execution and Positioning F350 Sequence No Illumination Fluctuation Follow Execution F300 Sequence No Camera Designation and Positioning F350 Sequence No Scene Switching and Positioning F350 Sequence No Camera Change Decrease by 1 F200/300 Sequence No Camera Change Increase by 1 F200/300 Sequence No Reset F200/300 Sequence NoScene Switching Decrease by 1 Sequence No Scene Switching Increase by 1 Sequence No Measurement, Inspection Termination Sequence No Scene Switching Arbitrary Sequence NoGeneral-purpose Command Send Sequence No General-purpose Command Send/Receive Sequence No 366 V600/V620 ID Controller Protocol Appendix M Appendix M 369 RS-422A Connections DIP Switch V600/620-CD1D DIP Switches 372 V600-CAjA DIP Switches Read ASCII/1 Sequence No Read ASCII/2 Sequence No Read ASCII/4 Sequence No Read ASCII/8 Sequence No Read Hexadecimal/1 Sequence No Read Hexadecimal/2 Sequence No Read Hexadecimal/4 Sequence No Read Hexadecimal/8 Sequence No Auto-read ASCII/1 Sequence No Polling Auto-read Ascii Sequence No Auto-read Hexadecimal/1 Sequence No Polling Auto-read Sub-command ASCII/4 Sequence No Polling Auto-read Sub-command ASCII/2 Sequence NoPolling Auto-read Sub-command ASCII/8 Sequence No Polling Auto-read Hexadecimal Sequence No Polling Auto-read Sub-command Hexadecimal/2 Sequence No Polling Auto-read Sub-command Hexadecimal/8 Sequence No.517 Polling Auto-read Sub-command Hexadecimal/4 Sequence NoWrite ASCII/1 Sequence No.518 Write ASCII/2 Sequence No 388 Write ASCII/4 Sequence No Write ASCII/8 Sequence No Write Hexadecimal/1 Sequence No Write Hexadecimal/2 Sequence No Write Hexadecimal/4 Sequence No Write Hexadecimal/8 Sequence No Auto-write Hexadecimal/1 Sequence No Auto-write ASCII/1 Sequence NoPolling Auto-write ASCII/2 Sequence No Polling Auto-write ASCII/4 Sequence No Polling Auto-write Subcommand ASCII/2 Sequence NoPolling Auto-write Subcommand ASCII/4 Sequence No Polling Auto-write Subcommand ASCII/8 Sequence No Polling Auto-write Hexadecimal/4 Sequence No Polling Auto-write Subcommand Hexadecimal/2 Sequence NoPolling Auto-write Subcommand Hexadecimal/4 Sequence No Polling Auto-write Hexadecimal/2 Sequence No Polling Auto-write Hexadecimal/8 Sequence No Polling Auto-write Subcommand Hexadecimal/8 Sequence NoData Check Sequence No Control Sequence No Command Processing Cancel Sequence No Error Information Read Sequence No Polling Auto-write Command Processing Cancel Sequence No Polling Auto-read Command Processing Cancel Sequence No 402 Appendix N Hayes Modem AT Command Protocol Compatible Modems Modem Settings Dialling Operand and Word Settings of Pmcr Setting Example Password Verification Data Send/Receive Password Verification OperationOperand Hang Up Command Escape ModeCommunication Errors Numbers Index 413 414 415 416 417 Revision History Revision code Date Revised contentOriginal production Authorized Distributor