Chapter6 Remote Operation; Rs232 Interface - ITech IT8700 Series User Manual

Dc programmable electronic loads

Hide thumbs Also See for IT8700 Series:

Programming manual (133 pages)

User manual (73 pages)

Manual (90 pages)

Table Of Contents

Table of Contents

There are three kinds of communication interfaces: Ether Net, USB, RS232.

The user can choose any one of them to communicate with PC.

Figure 6-1IT8700 rear panel communication interface (take example of IT8702P)

6.1 RS232 interface

RS232 interface：use a cable with two COM interface（DB9）to connect load

and PC. It can be activated by <Shift> + <System> key on the front panel.

NOTE: There're two COM interface on the rear panel of IT8700：the left 9-pin

COM interface is RS232 communication interface；the right 9-pin COM serial

port connection（extended keyboard interface）. All SCPI commands are

available through RS-232 programming. The EIA RS-232 standard defines the

interconnections between data terminal equipment （ DTE ） and data

communications equipment （ DCE). The electronic load is designed to be a DTE.

It can be connected to another DTE such as a PC COM port through a null

modem cable

RS-232 data format

The RS-232 data is a 10-bit word with one start bit and one stop bit. The

number of start and stop bits is not programmable. However, the following

parity options are selectable using the front panel<Shift> + <System> key.

Parity options are stored in non-volatile memory.

Baud rate

The front panel <Shift> + <System> key allows the user to select one of the

following baud rates, which is stored in non-volatile memory: 4800 9600 19200

38400 57600 115200.

RS-232 flow control

The RS-232 interface supports the following flow control options that are

selected using the front panel <Shift> + <System>key. For each case, the

electronic load will send a maximum of five characters after hold-off is asserted

by the controller. The electronic load is capable of receiving up to fifteen

additional characters after it asserts hold-off.