Vaisala PTU300 Podręcznik Użytkownika Strona 109

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Chapter 4 ________________________________________________________________ Operation
VAISALA ______________________________________________________________________ 107
5. Select Invert relay 1... , press the TEST key. Now the selected
relay output is forced to opposite state. Press the OK key to
return to normal operation.
6. Press the EXIT key to return to the basic display.
RTEST
Use the serial line command RTEST to test the operation of the
relays.
RTEST [x1 x2 x3 x4]
where
x
= ON/OFF
Example: Activate and then release all four relays.
>rtest on on on on
ON ON ON ON
>
>rtest off off off off
OFF OFF OFF OFF
>
Enter the command RTEST without parameters to stop testing.
Operation of RS-485 Module
RS-485 interface enables communication between RS-485 network
and PTU300 transmitter. The RS-485 interface is isolated and offers a
maximum communications rate of 115 200 bits/s. (For maximum bus
length of 1 km, use bit rate 19200 b/s or less.)
When selecting an RS-232-RS-485 converters for the network, avoid
self powered converters as they don't necessarily support the needed
power consumption.
Echo function shall be always disabled (OFF) when using the 2-wire
connection. When using the 4-wire connection you can disable/enable
the echo setting.
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