CIRCUTOR QNA500 series - Manual (Page 110)

POWER QUALITY ANALYZER QNA500 8IO
QNA500 8IO Instruction manual 110 / 111
17.- APPENDIX 1 – COMMUNICATIONS RS-485 WITH CVM POWER
ANALYZERS
M-BASE has gateway functions for other devices trough RS-485 port. Other devices can be connected
to this bus RS-485 to communicated through Ethernet using protocols like MODBUS/RTU or
MODBUS/TCP.
You can connect devices in the RS485 bus to communicate and then use M-BASE module as a
TCP/IP gateway. To do this, check the instructions of the devices connected to the RS485 bus in order
to connect correctly the Rx, Tx wires.
As an example, we supply an example diagram of connection between CIRCUTOR power analyzers
CVM-Mini.
RS485 Connector (MODULE M-BASE)
FRONT VIEW
(RJ45)
RS-485
TERMINALS
1 (Tx) A(+) (Rx)
2 (Rx) B(-) (Tx)
3 (CTS) -
4 (GND) -
5 (GND) -
6 -
7 -
8 -