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opposite, please attach the external power to the TCF-90 when the LED
is OFF.
NOTE
Please turn the SW4 back to “Std.” mode (default) when
finishing the test. During the “Test” mode, TCF-90 WILL NOT
perform any data transmission.
Optional External Power
In most circumstances, TCF-90 should be working without ext. power if
RTS/DTR is connected. For those application that the host does not
have the handshake lines available, or the both RTS/DTR are at “OFF”
states in which the interface chip of the attached serial port provides
less power than the general ones, an external USB power cord or DC
power supply should be used.
In short, performing the “LED Port Power Indicator” test is
recommended to verify if the power source is enough.
Ext. Power Supply
If additional external power is required, TCF-90 is designed to be
connected to a standard 5 to 12 VDC power adapter.
SW4
