Generex CS121BL, Руководство пользователя

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Figure 120: LED-Matrix display network integration
Any device operating as an RCCMD Sender like a computer running UPSMAN software,
RCCMD clients, CS121 Web managers and other RCCMD 2 compatible products can send
text messages or environmental data values to the LED-Matrix and can add sounding alarms
for warnings that require immediate attention. Users can also use the built in Web server
interface of the LED-Matrix to relay alarms and messages without the use of an RCCMD
Sender. The user simply enters the message into the Web browser that is to be relayed
through the LED-Matrix.
For further information and description please take a look into the LED-Matrix User Manual .
7.7 MODBUS/PROFIBUS/LONBUS
MODBUS
Modbus is a serial communications protocol for use with its programmable logic controllers
(PLCs). It has become a de facto standard communications protocol in industry, and is now the
most commonly available means of connecting industrial electronic devices. Modbus allows for
communication between many devices connected to the same network, for example a system
that measures temperature and humidity and communicates the results to a computer.
Modbus is often used to connect a supervisory computer with a remote terminal unit (RTU) in
supervisory control and data acquisition (SCADA) systems.
The CS121-series support MODBUS over IP and MODBUS over RS232 (exclude BUDGET
models) generally. Additionally, the CS121MODBUS-series also includes an RS485 interface
at COM2, which can be connected to a 485Bus-system.
Note: MODBUS response changed: Now MODBUS will respond with "-9999"
or with "-1", if values are requested, which are not available at this UPS
or other device. This shall clearly identify that this value is "not
available".
Note: If you use SNMP polling to retrieve data from the CS121, you should
disable the MODBUS port to avoid interrupts and performance slow
down.