ST80/ST80L Flow Meter INSTALLATION
Fluid Components International LLC 25
Modbus Configuration
Refer to Figure 16 on page 19. To set J8 for Modbus operation install a 2 mm jumper shunt onto the J12 and J13 jumper pins as shown in
Table 3 below.
Table 3 – Modbus Select Jumpers
Install Jumper Shunt over Pins
As required for your application set 2 mm jumper shunts as needed to configure the bus lines as listed in Table 4 below. Termination is
typically required for applications with faster data rates or long cable lengths or both. Enable the instrument’s terminator as required for
your application. Line biasing is used to ensure that lines are at a known state (noise can cause a false trigger on a floating line). Check
first that the RS-485 network is not already biased before enabling the ST80/ST80L line biasing.
Table 4 – Modbus Line Configuration Jumpers
Note: 1. ● = Jumper Installed
F
OUNDATION Fieldbus/PROFIBUS Connections (Option)
Referencing Figure 14 connect the F
OUNDATION Fieldbus/PROFIBUS device/network to Phoenix connector J8 on the main board. Note that
the J8 connector is also used for the Modbus wiring (only one interface can be active at a time). See Figure 22 above. Connector J8
accepts 24–12 AWG (0.2 mm
2
– 1.5 mm
2
) wire (refer to Table 2, page 17 for wire size vs. length info).
Connect the ST80/ST80L to a Fieldbus/PROFIBUS device/network as shown in Figure 24 below. Note that devices are connected in
parallel (star fashion).Use a terminator as appropriate for your application. For details on PROFIBUS operation refer to the ST80/ST80L
PROFIBUS PA manual 06EN003493. For details on F
OUNDATION Fieldbus operation refer to the ST80/ST80L FOUNDATION Fieldbus
manual 06EN003492.
Foundation Fieldbus/PROFIBUS operation is provided through an optional add-on card that plugs into the
ST80/ST80L main board.
Figure 24 – Fieldbus/PROFIBUS Wiring
ST80/ST80L
Fieldbus/
PROFIBUS
Interface (J8)
Field
Device
Add’l
Field
Device
Wire Pair
FB_A
FB_B
Terminator Terminator
Signals
TT
C01432-1-1
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