User Manual of EM730 Series Inverter characters are defined in the standard protocol, it is impossible to avoid response delay, at least “3.5-character time interval + 1 ms (chip stabilization time of 485 protocol, t wait2 )”. The specific minimum time interval is related to the baud rate. If the baud rate is 9600bps, the minimum response delay is 5ms (3.5Ч10/9600+1=4.64≈5). If the communication data involves EEPROM operation, the time interval will be longer. [ 7 ]: Valid data frame: Sent by the external master station (not keyboard) to this machine. The function code, length and CRC of the data are correct. Fig.
4-23 shows the data sending segment (t send ), sending end segment (t wait1 ), 75176-to-sending wait segment (t wait2 ), data return segment (t return ), and 75176-to-receiving wait segment (t wait3 ). Fig. 4- 23 Timing Parse Diagram of Complete Data Frame 11.4.4 Communication timeout The communication time interval △ t is defined as the period from the previous reception of valid data frames by the slave station (inverter) to next reception of valid data frames. If △ t is greater than the set time (depending on the function code F10.03; this function is invalid if set to 0), it will be regarded communication timeout. 392