29
Acuvim-L
Fig.2-28 DI input circuit diagram
The circuit drawing of digital input is simplified as fig.2-28. When K is switched
off, OUT is in high state. When K is switched on, OUT is in low state. The wire of
digital input should be chosen between AWG22~16 or 0.5~1.3mm
2
.
2.3.8 Communication
Acuvim-L series meter uses RS485 serial communication and the Modbus-
RTU protocol. The terminals of communication are A, B, and S (14, 15 and 16).
A is differential , B is differential signal - and S is connected to the shield
of twisted pair cable. Up to 32 devices can be connected on a RS485 bus. Use
good quality shielded twisted pair cable, AWG22 (0.5mm2) or larger. The overall
length of the RS485 cable connecting all devices can not exceed 1200m (4000ft).
Acuvim-L series meter can be used as a slave device of a master device such as
PC, PLC, Data Collector and RTU.
If the master does not have RS485 communication port, a converter(such as a
RS232/RS485 or a USB/RS485 converter) will be required. Typical RS485 network
topologies include line, circle and star (wye).
Data transfer format is start bit + 8 data bits + stop bit. NON1, NON2, odd
and EVEN could be selected in the mode of parity. NON1 represents non-parity,
single stop bit; NON2 represents non-parity, double stop bit; odd represents odd-
parity, single stop bit; EVEN represents EVEN-parity, single stop bit.
Photo-MOS
circuit
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