Vaisala PTB330 - Manual (Page 31)

Chapter 3 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 29
To connect the signal and power supply wires:
1. Open the barometer cover by taking out the four cover screws.
2. Insert the power supply wires and signal wires through the cable
bushing in the bottom of the barometer; see the grounding
instructions in the previous sections.
3. Connect the RS-232 user port cables to terminals RxD, GND,
and TxD. For more information about the RS-232 connection,
see section Serial Line Communication, on page 64.
4. When wiring the RS-485 module, the relay module or the analog
output module, see sections RS-422/RS-485 Interface Module
on page 42, Relay Module RELAY-1 on page 40, and Analog
Output Module on page 38.
5. Connect the power supply wires to the connectors: POWER 10
... 35V (+) and (-) terminals.
6. Turn on the power. The indicator led on the cover is lit
continuously during normal operation.
7. Close the cover and replace the cover screws. The barometer is
ready for use.
NOTE If you have chosen the external power control option, you must
remove the wire between the "Power control" and "Power +" -
terminals prior to using the power control feature.