DTL-IFB-485 Просмотр технического описания (PDF) - Murata Manufacturing

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DTL-IFB-485

Interface Board for Serial-Input Electronic Loads

Murata Manufacturing 

DTL-IFB-485

Interface Board for Serial-Input Electronic Loads

WinBurn™ DTLx485 Commands: Set Address

The Active X Control for a particular DTL-IFB-485 unit, will

then have its Address set to match the Rotary Switches on

the DTL-IFB-485. Physically, the rotary switches set the

Hex Address for a particular DTL-IFB-485. Example: A123

is equal to 7B in Hex so rotary switch SW2 is set to "7" and

SW3 is set to "B", while the DTLx485 Control is has its Row

set to "7" and its Column set to "B". Refer to Figure15 for

examples of dimensioning the Rows and Columns in code.

Whereas each rotary switch has 16 settings, in the coding

example of Figure 15, arrays have been setup for the rows

and columns.

The desired load current of any DTL-IFB-485 and DTLXA

Series of 100 Watt loads is then entered in the "Set

Current" text box. Figure 15 coding shows how a low and

high value setting can be used, should dynamic loading

and/or power-cycle burn-in applications be desired.

Users must be careful to have provided appropriate

heatsink/cooling to the DTLXA Series 100W electronic load

to avoid catastrophic failure. The DTLXA Series is rated for

only 10 Watts of power dissipation without external

heatsink/cooling. Clicking on the "Set Current" button, will

now update the load with the value entered in the text box.

The DTL-IFB-485 has an isolated on-board 12-bit A/D,

typically used to read the voltage of a power source (DUT)

under test or burn-in. Clicking on the "Read Voltage" button

of the DTLx485 Control, will return the Voltage reading of

the DUT. User's can also poll the DTL-IFB-485's Fault line.

The Fault line goes active whenever the DTLXA Series falls

below its compliance voltage (typically 2.5V, but 0.6 Volts

for model DTL2A-LC). Users desiring to reset the load to

no current, can click on the DTLx485 Control button "Reset

Load".

A "timer" function can be used, should users desire to

perform a dynamic burn-in, switching between high and

low-levels of current. Review the General Declarations

coding for a Form Load on the next page for examples of

this usage.

The nature of the protocol of interfacing through an RS-485

port to communicate to the DTL-IFB-485 boards does not

lend itself to fast updates (although all loads can be

updated at the same time). Although users can control up

to 256 DTL-IFB-485s from a single PC port, they may find

that 128 units on a single RS-485 port, provides

reasonable update times for burn-in applications. Also,

multiple ports on a single PC approach can be used to

extend the # of units beyond the 256 limit of a single COM

port.

Figure 14. OK or Open Port Invalid Message

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