RS-485 Communication Features
• An error response starts with NAK and ends with EOT.
• A station ID indicates the inverter number and is displayed as a two-byte ASCII-HEX
string that uses characters 0-9 and A-F.
• CMD: Uses uppercase characters (returns an IF error if lowercase characters are
encountered)—please refer to the following table.
Request monitor registration
Perform monitor registration
• Data: ASCII-HEX (for example, when the data value is 3000: 3000 → ‘0’’B’’B’’8’h →
30h 42h 42h 38h)
• Error code: ASCII-HEX (refer to 7.3.1.4 Error Code on page 284)
• Transmission/reception buffer size: Transmission=39 bytes, Reception=44 bytes
• Monitor registration buffer: 8 Words
• SUM: Checks communication errors via sum.
SUM=a total of the lower 8 bits values for station ID, command and data (Station
ID+CMD+Data) in ASCII-HEX.
For example, a command to read 1 address from address 3000:
SUM=‘0’+‘1’+’R’+‘3’+‘0’+‘0’+‘0’+’1’ = 30h+31h+52h+33h+30h+30h+30h+31h = 1A7h
(the control value is not included: ENQ, ACK, NAK, etc.).
Broadcasting sends commands to all inverters connected to the network simultaneously. When
commands are sent from station ID 255, each inverter acts on the command regardless of the
station ID. However no response is issued for commands transmitted by broadcasting.
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