37The 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 connector of the electronic load and the USB interface connector of
computer for the communication.
PC Load
IT-E131 communication
cable
COMPUTER
INSTRUMENT
RX
TX
IT-E131 ISOLATED
COMMUNICATION CABLE
TTL(5V)RS232 ISOLATION
859666668889942311
IT
Note: Do not connect the DB9 connector of the electronic load directly to a PC or other RS232 port.
2 Communication between electronic load and PC Before using the remote operation mode, please make sure that the baud rate and communication address in
electronic load are the same as in the computer software, otherwise, the communication will fail, you can change the
baud rate and communication address from the front panel or from computer.
1
．
Address: the range is from 0 to 254,default setting is 0
2
．
Baud rate: 4800,9600,19200 and 38400 are selectable, default setting is 4800
3
．
Data bit
：
8 bit
4
．
Stop bit
：
1
5
．
Parity
：
None
3. Frame Format Frame length is 26 b ytes. 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 FE, occupies one byte.
3
．
Each comm and occupies one byte . Following is the comm and details.
20H Selecting the Remote control mode
21H Selecting the input on/off state
22H Setting the max input voltage
23H Reading the max setup input voltage.
24H Setting max input current