References of Load Communication Interfaces
Copyright © ITECH Electronic Co., Ltd. 80
Chapter5 References of Load
Communication Interfaces
IT8800 series electronic load is provided with three communication interfaces
to communicate with a computer for selection, including RS232, USB and
GPIB.
5.1 RS232 interface
Cable connection load with both ends of COM interface (DB9) and computer.
Composite key [Shift] + 5 on front board can be used to enter system menu for
activation.
In RS-232 interface, all SCPI commands can be used for programming. If
RS-232 interface is selected, in accordance with internal connection of data
terminal equipment (DTE) and data communication equipment (DCE) as
defined in EIA RS-232, the load is connected to another DTE (e.g., PC COM
interface) with direct-connected Modem cable.
NOTE
The rear board of IT8800 series has two COM interfaces. The upper 9-pin COM interface
connector is RS232 interface; and the lower 9-pin COM interface is external signal control
interface.
RS-232 setting in procedure should be consistent with that in system menu of front board.
Press composite key [Shift] + 5 to change (if necessary). Send a ^C or ^X character string to
the load to pause data transmission. It will clear any uncompleted operation and waive any
uncompleted output.
RS-232 data format
RS-232 data comprises start bit, odd and even parity check bit, stop bit and
8-bit data bit. Start bit and stop bit are not editable. However, next odd or even
item can be selected by front board [Shift] + 5. The odd and even items are
saved in NVM.
Baud rate
Through front board [Shift] + 5, the user may select one Baud rate saved in
NVM: 4800 9600 19200 38400 57600 115200
RS-232 Connection
Use RS-232 cable with DB-9 interface because the RS-232 serial port can be
connected controller (e.g. PC) serial port. Do not use modulating cable of
air-conditioner. Refer to Table 2-2 for plug pin.
If your computer is provided with a RS-232 interface with DB-25 plug, a cable
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