GDM-8246 MULTIMETER
PROGRAMMER MANUAL
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4
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The GPIB connection testing
If you want to test whether the GPIB connection is working or not, you
can send a GPIB command from computer. For instance, the query
command
*idn?
should return the Manufacturer, model number, and firmware version in
the following format:
GW.Inc,GDM-8246,FW1.00
If you do not receive a proper response from the DMM, please check if
the power is on, the GPIB address is correct, and all cable connections
are active.
GDM-8246 MULTIMETER
PROGRAMMER MANUAL
⎯
5
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3. CONNECTING
THE DIGITAL MULTIMETER
VIA
RS232 INTERFACE
The RS232 interface capabilities:
The RS232 interface provides a point-to-point connection between two
items of equipment such as a computer and the DMM. There are some
parameters you need to set on the both sides. Once you have set these
parameters, you can control the DMM through the RS232 interface.
z
Baud rate: You can set rates of 1200, 2400, 4800 or 9600 baud.
z
Parity bit: none.
z
Data bit: 8 bits.
z
Stop bit: 1 stop bit.
z
Data flow control: none.
Notes for RS232 installation
The DMM is a DTE device with a 9-pin D-type shell RS232 connector
located on the rear panel. Figure 1 shows the equipment of 9-pin
connector (male) with its pin number assignments. Figure 2 shows the
wiring configuration for DB9 to DB9. When the Digital Multimeter is set
up with a RS232 interface, please check the following points:
z
Do not connect the output line of one DTE device to the output line
of the other.
z
Many devices require a constant high signal on one or more input
pins.
z
Ensure that the signal ground of the equipment is connected to the
signal ground of the external device.
z
Ensure that the chassis ground of the equipment is connected to the
chassis ground of the external device.
