ICS ELECTRONICS 9099, Instruction Manual

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2
3. Use a pair of #22-#24 twisted wires to connect DC power to the 9009’s
screw terminal strip. Set jumper W14 to REG for +5.5 to +15 Vdc
power. Use the P1 position only for 5 Vdc regulated power.
4. Connect a PC to one of the 9009’s interfaces and the serial cable to
the Modbus slave device.
To use the Ethernet interface, connect a cable to the 9009’s RJ45 con-
nector and follow the directions in Section 2.6 for setting the computer
to communicate with the 9099. Use ICS’s VXI-11kybd program or
a web browser to access the 9099 at its default IP of 192.168.0.254.
See Section 2.6 for detailed instructions.
To use the GPIB interface, follow the SCPI Tree in Table 3-2 to con-
figure the unit. Address the 9009 at its default GPIB address of 4. See
Section 2.7 for detailed instructions.
To use the USB interface, install Microsoft’s Virtual COM Port Driver
from the Support CD as directed in Section 2.8. Initialize the virtual
COM port at 115,200 baud.
5. Send the 9009 an *IDN? query to readback its IDN message and to
verify communication with the 9009.
6. Review the factory settings in Table 1-2 to determine if the baud rate
or any other settings need to be changed for the Modbus slave device.
Use the ‘D’ command (see Table 3-5) to set the Modbus timeout to
1000 for initial tests.
7. Obtain the register numbers from the Modbus slave device manufacturer.
Use the Modbus read commands in Table 3-5 to query the Modbus
slave device to verify communication. Try reading and writing to
several registers to verify that you have good communication with
the Modbus slave device.
8. Check with the Modbus slave device manufacturer to obtain the
device’s response times. If data is not available, use an oscilloscope
or logic analyzer to measure the Modbus device response time from
the end of a query to the end of the response message. Try several
different queries. Set the timeout to the manufacturer’s time or to the
longest measured time plus an additional 25 milliseconds. Save the
new setting with the ‘*SAV 0’ command..