OPERATION ST51A/ST75A/ST75AV Mass Flow Meters
28 Fluid Components International LLC
Main Menu
The serial interface provides a main menu, shown below, to access various functions. The FC88 shows this menu by scrolling through the lines.
Mode?
1=RS-232 2=Modbus
3=HART 4=Config
5=Update Firmware >
Choose a mode by entering its number.
● RS-232 (1) – Enter “1” to place the instrument in the RS-232 serial pass-through mode. The display responds with:
ST51A/75A Pass Thru
(ESC to exit)
In this mode the console or FC88 display shows the same information displayed by the instrument. This is the normal mode when
using the instrument’s serial port (for temporary programming access or parameter review or both). Once in the RS-232 mode press
ESC (FC88: SHIFT+ESC) to return to the main menu.
● Modbus (2) – Enter “2” to operate the instrument in the Modbus mode.
● HART (3) – Enter “3” to operate the instrument in the HART mode.
● Config (4) – Enter “4” to select the configuration menu for ST51A/ST75A (1), Modbus (2), or HART (3).
● Update Firmware (5) – Reserved for factory-use only.
Enter “ESC” (FC88: SHIFT+ESC) at any time within a mode to return to the main menu.
Top Level Menu Commands
Place the instrument in the RS-232 mode to access the serial interface top level menu commands. These commands are listed in Table 8,
page 33. Enter (or for FC88, press) the uppercase letter as listed in the table followed by [ENTER] to run the command. These commands
can be exited at any time by entering “Q” followed by [ENTER]: D, F, G, L, S, V and W. Some commands cannot be exited until an
entry/choice is made or the power is recycled.
Some commands result in a prompt asking for a factory pass code. If this occurs, contact FCI Field Service. Do not change any
parameters that require this code without understanding the instrument’s operation.
Secondary Commands: CLI
The instrument can be accessed with a secondary set of CLI (command line interface) commands. Access these commands using the “Y”
command (passcode = 357). With CLI commands an internal parameter is assigned a 2-character command mnemonic for reading or
writing its value. The basic command format (syntax) for a CLI command is:
R
yz
[ENTER] Read
W
yz
= <value> [ENTER] Write
…where R (Read) or W (Write) is followed by the 2-character (
yz
) command mnemonic followed by [ENTER]. When writing a value, the 2-
character command mnemonic is followed by an equals sign or space, the data value and then [ENTER]. To exit CLI command mode
press [ENTER] twice. See Table 9, page 34 for the complete list of CLI commands. In this table the parameter’s command function shows
whether it can be written or read (WR), write-only (W) or read-only (R).
Start-up and Commissioning
1. Verify all input power and output signal wiring is correct and ready for initial power start-up.
2. If displaying/configuring instrument programming connect the FC88/computer to the flow meter (Power OFF first). See Serial Interface
Connector J9 page 25 for serial port connection details.
3. Apply power to instrument. The instrument initializes in the Normal Operation Mode with all outputs active. For instruments with the
display option: Observe that the display shows flow with the factory-set flow units. The instrument indicates 0.000 for zero or no
process flow. Allow 10 minutes for the instrument to reach thermal equilibrium.
Table 6 below lists the most often used top level serial interface commands for configuring the instrument. Refer to Table 8, page 33 for
the complete list of commands.
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