B&K Precision MDL Series - Programming Manual - Manual (Page 7)

7
Device Clear
The electronic load responds to the Device Clear (DCL) and
Selected Device Clear (SDC) interface commands. They cause the
electronic load to clear any activity that would prevent it from
receiving and executing a new command (including *WAI and
*OPC?). DCL and SDC do not change any programmed settings.
DCL,SDC
GPIB Address
The electronic load operates from a GPIB address that is set from the front panel. To set the GPIB
address, press Shift + ⑦ (System menu) on the front panel and enter the address using the Entry keys.
The address can be set from 0 to 30. The GPIB address is stored in non-volatile memory.
1.2 RS-232 Capabilities of the Electronic Load
Use a cable with two serial interfaces (DB9) to connect the electronic load and PC. It can be activated
by selecting in of the System menu (Shift + ⑦ on the front panel). NOTE:
There are two serial interfaces on the rear panel of the MDL001: the left 9-pin COM interface is the RS-
232 communication interface and the right 9-pin COM serial port connection is not for use. 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 and can be connected to another DTE such as a PC COM
port through a null modem cable.
NOTE: The RS-232 settings in your program must match the settings specified in the front panel System
menu. Press Shift + ⑦ on the front panel to enter the System menu if you need to change the
settings. You can break data transmissions by sending a ^C or ^X character string to the electronic load.
This clears any pending operation and discards any pending output.
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 are not programmable. However, the following parameters are
selectable in the System menu using the front panel Shift + ⑦ key.
Parity=None Start Bit 8 Data Bits Stop Bit