MD Mode Description, MD Mode SRQ | TDK 750W HALF RACK manual

7.4 MD MODE OPTION (Factory Installed)

7.4.1MD Mode Description

The GEN supply is capable of operating in a multi drop environment - more than 1 supply con- ducting serial communications on a single serial bus. A maximum of 31 GEN supplies can oper- ate in this single bus. Upon power up the Gen will enter the point-to-point mode in which it is as- sumed that only 1 supply will operate on a serial bus. MD Mode must be enabled - Ref. Section

7.10.2.2.The user must set all Slave supplies to a unique address. No two supplies may have the same address.

7.4.2MD Mode enable – Serial communication mode

Refer to section 7.10.2.2. MD Mode is entered into via a Single byte command. In MD Mode the Master supply shall operate in one of the two serial modes, RS232 or RS485, depending upon the rear panel DIP switch setting and the Slave supplies shall operate in the RS485 serial mode.

7.4.3MD Mode SRQ

In MD Mode the SRQ generated by the supply is replaced by a single byte SRQ sent two times in sequence. The SRQ byte, in binary, will contain the address of the supply in the least significant 5 bits with bits 5 and 6 set to logic zero and bit 7 set to logic 1. Ref. Table 7-4.

7.4.4Communication Collisions

In MD Mode it is possible to have one supply issue an SRQ while another supply is transmitting data/response to a command. When this happens, the HOST PC will receive garbled data and assume that the data/response was corrupted and thus re-send the command - the SRQ will probably be lost. The method of recovery will be SRQ retransmission, Ref. Section 7.4.5, or poll- ing all attached supplies to see who issued the SRQ - available by reading the SEVE? Register.

7.4.5MD Mode SRQ Retransmission

The supply can be commanded to retransmit the SRQ at regular intervals until it is answered to by the HOST PC (Ref. Section 7.10.2.4). The retransmission interval is 10 ms plus the supply address multiplied by 20 ms.

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TDK 750W HALF RACK MD Mode Description, MD Mode enable Serial communication mode, MD Mode SRQ, Communication Collisions

Contents

Genesystm 750W Half Rack Page Page Genesys Manual Supplement Table of Contents Front and Rear Panel Controls and CONNECTORS………... ……… ……… Isolated Analog Progamming Option ……………………………..…… Warranty Safety Instructions Safety Instructions SICHERHEITS-INSTALLATIONS Anweisungen Sicherheits-und Warnsymbole Anderungen and BauteileersatzUmweltbedingungen Features and options General InformationIntroduction General Description Multiple output power system Control via the serial communication portAnalog voltage programming and monitoring Parallel operation Accessories Specifications Chapter Front Panel Supplemental Characteristics Genesystm Genh 750W Power Supplies Outline Drawings Installation GeneralPreparation for USE Initial Inspections Single unit installation Rack Mounting AC Input Power Connection LOCATION, Mounting and CoolingAC Source Requirements GENH/RM Rack Mounting outline drawings TURN-ON Checkout Procedure AC Input ConnectorAC Input Cord General Constant Voltage Check Constant Current CheckOVP Check UVL Check Connecting the Load Wire termination AWG Noise and Impedance Effects Inductive loadsMaking the load connections 6V to 60V Models Bus-bars shield mounting 80V to 600V Models 83-507-5002 Rev. B Connecting single loads, local sensing default Connecting single loads, remote sensingConnecting multiple loads, radial distribution method Multiple load connection with distribution terminals Grounding outputs Sense wiring Output Terminal GroundingLocal and Remote Sensing Local sensing 10.4 J2 sense connector technical information Remote sensing Front and Rear Panel Controls and Connectors Front Panel Controls and IndicatorsVoltage Auxiliary Function Rear Panel Connections and Controls Rear panel connections and controls Number Description Rear Panel SW1 Setup Switch 1 SW1 position function Rear Panel J1 Programming and Monitoring Connector Resetting the SW1 switchMaking J1 connections 83-507-5002 Rev. B Signal EnainIfcom Local Constant Voltage Mode Constant Current ModeLocal Operation Standard Operation Setting the OVP level Resetting the OVP circuitOver Voltage Protection OVP Automatic Crossover Output SHUT-OFF SO Control VIA Rear Panel J1 Connector Under Voltage Limit UVLFoldback Protection Output ON/OFF Control ENABLE/DISABLE Control VIA Rear Panel J1 Connector CV/CC Signal Psok Signal Over Temperature Protecton OTPLast Setting Memory SAFE-START and AUTO-RESTART Modes Series Operation Series connection for increased output voltage Series connection for positive and negative output voltage Series connection for positive/negative output voltages Setting up the Master unit Setting up the Slave unitsParallel Operation Basic parallel operation Setting Over Voltage protection Setting Foldback protectionAdvanced parallel configuration Setting the units as Master or Slave Master and Slave units default operation To release units from Slave modeCurrent display accuracy AST OFF OUT OFF DAISY-CHAIN Connection Front Panel Locking Unlocked front panel Locked front panel Remote Analog Programming LOCAL/REMOTE Analog Indication Down Remote voltage programming connection Resisitive Programming of Output Voltage and Current Limit Remote resistive programming Remote Monitoring of Output Voltage and Current RS232 & RS485 Remote Control Configuration Rear Panel RS232/RS485 Connector 6 RS232/RS485 port in Local modeFront panel in Remote mode MD Mode Description MD Mode enable Serial communication modeMD Mode SRQ MD Mode SRQ Retransmission Connecting Power Supplies to RS232 or RS485 BUS Single power supply Communication Interface Protocol Error Messages Command SET Description Initialization Control Commands ID Control CommandsOutput Control Commands DVC? FilterFILTER? OUT? Global Output Commands Single Byte Commands Enable MD Mode MD Mode Option RequiredDisable SRQ retransmission MD Mode Option Required Enable SRQ retransmission MD Mode Option Required Addressed commands with response Read registers Print Power On TimeRetransmit Last Message Test if MD Mode is Installed Addressed commands without response Acknowledge SRQRe-enable SRQ with out reading/clearing the Seve Register 110x STATUS, Error and SRQ Registers Status Control Commands Conditional Registers TXD Service Request Enable and Event Registers BIT Fault Enable Register Fault Event Register Status Enable Register Status Event Register Power supply set-up Serial Communication Test SET-UPCommunication Test Specifications Isolated Analog Programming Option1 0-5V/0-10V Option PN IS510 PPM/C Isolated Programming & Monitoring Connector Setup and Operating Instructions Maintenance OUP Fuse Rating