SOMMER USH-9, Руководство пользователя

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12.3 RS-485
12.3.1 What is RS-485?
RS-485 is a serial communication method for computers and devices. It is currently a widely used
communication interface in data acquisition and control applications where multiple nodes com-
municate with each other.
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12.3.2 What can I do with it?
RS-485 communication is primarily used to trigger measurements and read their results. It also per-
mits to change parameters of the USH-9.
12.3.3 Configuration
The USH-9 has serial RS-485 communication enabled by default. If the device is integrated into a RS-
485 network or connected to a stand-alone data acquisition system, e.g. a data logger, the para-
meters listed in
RS-485 Protocol may need to be adapted.
System key and device number
The system key and device number are used to identify a USH-9 in a bus system. This is essential if
multiple devices ( USH-9 and data loggers) are operated within the same system.
System key
The system key separates different conceptual bus systems. This may be necessary if the remote
radio coverage of two measurement systems overlap. In general, the system key should be set to
00 .
Device number
The device number is a unique number that identifies a device in a bus system.
OP, measurement output
The serial data output can be triggered in the following ways:
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https://www.lammertbies.nl/comm/info/RS-485.html
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