Type 2530H1
13
Verifying the Network Baud Rate
Note
After changing the switch positions on
the multiplexer or RS232-to-RS485 con-
verter, power to the device must be re-
moved and reapplied before the change
will become effective.
The HART interchange multiplexers, RS232-to-RS485
converter, and the ValveLink software all must com-
municate at the same rate for the network to function
properly. Setting the baud rate at 38.4K baud provides
the maximum data update rate.
The RS232-to-RS485 converter and HART inter-
change multiplexer are preset for a baud rate of 19.2k
baud. To select a 38.4k baud rate or to verify the
switch settings, refer to the appropriate switch setting
paragraph in the Installation section of this manual.
To verify the baud rate of the ValveLink software:
1. Start up the software by double clicking on the Val-
veLink icon.
2. At the logon display, enter a username and pass-
word for a user that has access to preferences.
3. From the menu bar, select Setup. Select Prefer-
ences from the menu.
4. If the Comm Ports page is not displayed, click on
the Comm Ports tab to display the page.
5. Select the one or two comm ports that have the
converters and multiplexers connected to them by
placing an X in the check box. Place an X in a check
box by clicking on the check box. To remove an X in a
check box, click on the check box to turn the X off.
6. Select either 9600 baud, 19.2k baud or 38.4k baud
by clicking on the appropriate option button. The 38.4K
baud selection is recommended.
7. Click on the Save button to save all selections. To
make these selections effective, exit the ValveLink
software and restart the application.
Verifying the HART Interchange
Multiplexer Addresses
Note
After changing the multiplexer switch
positions, power to the multiplexer must
be removed and reapplied before the
change will become effective.
There are 32 available addresses for the HART inter-
change multiplexer, 0 through 31. Be sure no two mul-
Figure 17. M1000 Series RS232 to RS485 Converter Front
Panel Showing LED Indicators and Power Switch
W6482/IL
tiplexers have the same address. To verify the multi-
plexer addresses:
1. Remove power from the multiplexer.
2. Verify the addresses by comparing the settings of
switches 1 through 5 with the settings listed in table 3.
Make any necessary changes to the switch settings.
3. Apply power to the multiplexer.
Verifying the RS485 Network
The RS485 network must be less than 3000 feet
(914.4 m) if one RS232-to-RS485 converter is used. If
the network is greater than 3000 feet (914.4 m), a se-
cond converter can be used as a repeater. Refer to
the converter manual for information on using the con-
verter as a repeater.
Be sure a 100 ohm resistor is connected across the A
and B terminals of the last multiplexer in the network.
Reading the Converter LED Indicators
The RS232-to-RS485 converter has three LEDs on
the front panel as shown in figure 17. In normal opera-
tion the LED configuration is as follows:
The LED labeled POWER is normally on indicat-
ing adequate power supply voltage is applied to the
converter.
The LED labeled TRANSMIT illuminates as data
is transmitted from the host computer onto the RS485
network. This LED will vary in intensity as the comput-
er communicates over the network.
The LED labeled FAULT illuminates if excessive
current is being drawn from the in24 Vdc, 1
Amp power supply. This LED should normally be off.
Reading the Multiplexer LED Indicators
The HART interchange multiplexer has three LEDs as
shown in figure 18. In normal operation the LED con-
figuration is as follows:
