6.2 Communication Media
30 pieces of SPM90 can work together in one network at most, which are
wired via NO. 22 shielded twisted pair. If no repeaters, then the longest
distance of wire should be 1200 meters.
6.3 Communication Protocol
SPM90 is in accordance with the MODBUS-RTU and DL/T 645-2007
protocol, which can be set via the setting interface. For detailed information of
protocol, please refer to the manual of “SPM90_MODBUS Communication
Protocol” and “SPM90_DL/T 645-2007 Communication Protocol”.
6.4 Communication Parameters
Whether the meter can communicate with the master station depends on
whether the communication parameters are correct. Communication
parameters include:
Meter address ID: This is the identification of the meter on the network. It’s
requested that the ID of every meter in the same network is the only one.
Baud rate of communication 1: 2400, 4800, 9600, 19200 are optional.
6.5 Anti Strong Electricity Function of Communication Port
Communication Port on SPM90 supports Anti Strong Electricity Function.
The meter won’t be burnt when wired into strong electricity (380VAC) for a
short time(within 5 mins). Communication function gets back to normal when
strong electricity is removed.
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