31 VFL Series User Manual v2.3 12/20
11.5 Using an Alarm Relay for Emergency Shutdown
A controller alarm relay can be wired in series with a control output to shut down a process to
avoid catastrophic conditions. The alarm relay can be programmed to remain closed in normal
operation and to open if a specific alarm setpoint is reached.
FIGURE 11.1 - ALARM OUTPUT WIRED TO CONTROL OUTPUT
11.6 RS-485 PC Interface Option
The optional RS-485 PC communications utility allows up to 32 controllers to be addressed
individually by a Windows PC. When communicating, the controller's keypad is inactive and
only the connected PC can control the VFL. Contact Extech for additional information.
12. Programming Menu 5 (Linear Input level)
Long press the up and down arrow keys for 5 seconds to access Menu 5. Use the SET button to
scroll. Use the SHIFT (<) key to select a digit for editing and then use the up/down arrows to
change the digit. Use the SET button to continue scrolling to the normal operating screen
when done.
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