Micromod MOD: 30ML and Modcell Maintenance for 2001N, 2002N, and 1800R - Manual (Page 58)

MOD30ML and Modcell Maintenance Manual
COMMUNICATIONS
4. If RS-485 communication is being used, verify that the connection at the computer
(Modbus Master) is made via an RS-485 interface card containing the required bus
stabilizing resistors.
NOTE: The Port Functionality attribute of the MSC block must be configured as a slave.
5. Apply power to the instrument.
6. Access the device setup display on the instrument front panel. Note the instrument
address and communication parameter settings, and verify that built-in (BI) MSC
communication is enabled.
7. Start the Application Builder software and access the Serial Port Setup menu, Figure 3.2
(see Section 3.2.1 for procedure) or start the ViZapp Software and access the Device
and Port Properties from the OPC Server (section 3.3.4). Select the serial port that is
connected to the instrument and confirm the port settings. The standard Base Addresses
are 3F8, 2F8, 3E8 and 2E8 for Com1 through Com4 respectively. If unsure of the
address, check the computer hardware manual for configuration information. Set the
Baud Rate, Data Bits, Parity, and Stop Bits to match the instrument values noted in Step
7.
8. Access the Communications Setup menu, Figure 3.5 (see Section 3.2.2 for procedure).
Set the communications type to Extended Modbus. Set the Modbus Address to match
the instrument setting and select the com port to be used. The ICN and Instrument
number settings listed on the menu have no effect when modbus communication is
selected.
9. Access the Instrument Status Display and click on the command line at the bottom of the
screen. Type R VERSION and click on Enter. This command returns the version of the
instrument. If the instrument responds, confirm that the reported version agrees with the
type of instrument that is being tested. The version return data is listed in Section 3.4.3.
10. If you are unable to establish communications, proceed as follows:
• Disconnect power and remove all analog and communications modules. Restore
power and try to communicate again via the R VERSION command.
• If the problem still exists, do the following:
• Disconnect power.
• Disconnect all instruments from the network, other than the one being
tested.
• Restore power and try to communicate again via the R VERSION
command.
• If still unable to communicate, replace the instrument.
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