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Vega NB-13 / User Manual
12
Revision 06 of 24 January 2022
“MODBUS SETTINGS” TAB
The “ModBus settings” tab is used when the ModBus devices are connected.
The modem at the time of polling the sensor can perform up to 10 read operations
(requests), at independent addresses. Each read operation can read up to 8 bytes of data (four
16-bit registers or 64-bit registers). This means that the maximum amount of encoder data read
out is 80 bytes. For each request, a response timeout is started. If the response is not accepted
during the timeout, the modem proceeds to the request at the next address. The timeout is set
in the "RS interface settings" section on the "
" tab.
Enable ModBus
– activates the ModBus functionality. The modem additionally polls the
ModBus device by events and puts the received data into a black box. When sending to the
server, the "modbus" key with data is added to the JSON message. If the checkbox is off, the
ModBus device is not polled, therefore, ModBus data is not accumulated in the black box, the
"modbus" key is missing in the JSON message.
Use 8V power - if the checkbox is checked, the modem supplies power to the "+8V"
contact, maintains the time specified in the "Warm-up time" field, and only then polls.
Warm-up time - time in seconds (from 1 to 60) from the moment of power up until the
moment of polling. It should be noted that the longer the warm-up time, the greater the
consumption of the modem.
ModBus poll - the button allows to poll the ModBus device in real time without adding
data to the black box. Can be used to debug ModBus connections. In this case, the request