SUNFAR Self-Defined Communication Protocol 71
message sent by main machine, it’s not necessary for slave machine to make any
feed- back to main machine.
1. Communication setting
F4.00=X0XX, select SUNFAR custom communication protocol.
2. Data structure
Available in three types of data transmission formats:
(1) 1-bit start bit, 8-bit data bit, 1-bit stop bit, no check.
(2) 1-bit start bit, 8-bit data bit, 1-bit stop bit, even parity check (factory
settings).
(3) 1-bit start bit, 8-bit data bit, 1-bit stop bit, odd parity check.
3. Baud rate
Available in five types of Baud rates: 1200bps, 2400 bps, 4800 bps, 9600 bps, 19200
bps.
4. Communication mode
(1) Adopt point-to-point communication mode with main machine for polling
and slave machine for response.
(2) Employ inverter keyboard to set up inverter serial interface communication
parameters, including local address, Baud rate and data format.
The main machine must be preset with the same Baud
rate and data format with the inverter.
5. Communication rules
(1) More than 5 bytes of start interval time between data frames should be
guaranteed and only messages in compliance with the specified start interval time
is valid after being identified.
(2) The main machine connection waiting time and maximum response time of
inverter are 8 bytes transmission time; if timeout occurs, it will be determined as
communication fault.
(3) If the inverter fails to receive any message after detecting time from
communication timeout (function code: F4.04), it’s identified as off-line fault, and
E550 Series Universal Low-Power Inverter
