5
06/2015, JK
Polling Mode
(AC powered unit only)
:
You can set the TL2-A to send data on command. This is useful for people who write data collection software that will request data
only when it is needed. To place the TL2-A in polling mode, select “PoLL” as the sample rate to be used under the recording section
of the TL2-A menu. (See Interface Menu Diagram) When the PC sends a question mark character (?) to the TL2-A, the TL2-A will
respond with the temperature. When the TL2-A is set to flash record mode, the polling feature will not work.
Temperature controlled Relay
(AC powered unit only)
:
The TL2-A comes equipped with a switchable relay. This relay will toggle whenever the temperature crosses the set point threshold
set through the user menu. The provided screw-terminal header can be wired in two configurations:
•
Terminals 1-2 are normally closed (NC) and will turn OFF (open) when the relay is set.
•
Terminals 1-3 are normally open (NO) and will turn ON (close) when the relay is set.
Figure 1: Relay screw-terminal header
The relay function can be implemented from the user menu. For the relay function to be active, the user must select ‘EnAbLE’ from
the relay menu. Also from the relay menu, the temperature set point can be configured. (‘rELAY’ -> ‘SEt’) Use the Up & Down
buttons to select the desired setpoint. Use the select button to select each digit to modify. Ensure this setpoint is correct before
selecting the ‘EnAbLE’ function. The relay set point will remain the same regardless of the unit selection (C, F or K).
Once the relay has been toggled, it will remain in that state until the user disables it using the Select button. If desired, the user will
then need to re-enable the relay from the user menu.
