FNM alpha SM 230, User Manual, Page: 19 / 72

18 19
Description of device-specific features
UART (optional)
The UART interface is a standard UART interface in 2-wire technology. The data is sent
and received serially in duplex method. The interface is configured as follows:
•
data rate: 115,200 baud
•
data bits: 8
•
stop bits: 1
•
parity: without
•
handshake: without
But please mind that no duplex operation is possible over the radio interface since no
separate channels for go-and-return channel are available.
PT1000
A 2-wire connection is possible by default. If desired, a 3- or 4-wire connection can also be
realized by an optional adjustment of the hardware.
Following, you can see the appropriate connecting diagrams.
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Fig.: 2-wire connection Fig.: 3-wire connection (optional)
optional switch off function on / off
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Fig.: 4-wire connection (optional) closed switch: unit in operation