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5
Chapter 1 Remote Operation Mode
DB9 in the rear panel of electronic load could connect with RS-232 through a TTL connector. The
following information may help you to know how to control the electronic load through PC.
1.1 IT-E121 RS232 Communication cable
The DB9 interface connector on the rear panel of electronic load is TTL level.You can use the
communication cable (IT-E121) to connect the DB9 interface with RS232 interface of PC.
1.2 IT-E122 USB Communication cable
The DB9 interface connector on the rear panel of electronic load is TTL voltage level; you can use
the communication cable (IT-E132) to connect the DB9 interface with the USB interface of PC.
Chapter 2 Communication Order for
Frame Format
Frame length is 26 bytes. Details as following:
AAH
Address
Command 4
—25bytes are information content
Parity code
Description
:
1
.
Start bit is AAH
,
occupies one byte.
2
.
Address range from 0 to 31, occupies one byte. 0XFF is boardcast address.
3
.
Each command occupies one byte. Following is the command details.
20H
Set the Remote control mode
21H
Set the input on/off state
22H
Set the max input voltage
23H
Enquire the max setup input voltage.
24H
Set max input current
25H
Enquire the max setup input current.
26H
Set max input power.
27H
Enquire the max setup input power.
28H
Set CC/CV/CW/CR operation mode of electronic load.
29H
Enquire the operation mode.
2AH
Set CC mode current value