User manual

GMC-I Messtechnik GmbH 29
3.4 Connections on the Rear Panel
The rear panel of the electronic load is shown as Figure 3.1, which mainly includes AC input part and communication interface part.
The AC input part includes AC input socket, Fuse holder, and Line voltage switch; the interface part includes RS-232 interface and the
interface for optional GPIB or USB.
Figure 3.1 Connections on the Rear Panel
AC input
AC power-line cord must be appropriate for your local standard.
Fuse: 250 V, 315 mA
Line voltage switch can select 110V or 220V.
The selected voltage should be in accordance with the proper voltage in your local place.
Commuication Interfaces
RS-232
The load provides a RS-232 interface, which is a standard DB9 pin connector using DTR and DSR to execute flow control.
The pin assignment is shown below:
Pinbelegung
The interface parameters can be set in the MENU, and you can use SCPI language for programming to realize the communication with
the load.
GPIB Interface
The load provides a GPIB interface, and you can set its address to any value between 0 and 30 in MENU. When multiple GPIB devices
are connected, each device on the GPIB interface must have a unique address that is not be used by the devices on other interfaces.
The address is set to “05” when the load is shipped from the factory.
USB Interface
The load provides a USB interface. You need to install the software provided by the factory in PC to realize communication with the
load.
USB and GPIB interfaces occupy the same expansion slot on the rear panel, so only one type interface can be chosen to install at the
same time, meanwhile, only one type interface can be used by the load to communicate with external devices.
Pin Input/Output Description
1 — not used
2 Input RXD Receive data
3 Output TXD Transmit data
4 Output DTR Data terminal ready
5 Common GND Ground
6 Input DSR Data set ready
7 — not used
8 — not used
9 — not used
RS232 interface
Fuse holder
AC input socket
Line voltage selector switch
115 V / 230 V
GPIB or USB interface