AH500 Programming Manual 6.19 Communication Instructions 6.19.1 List of Communication Instructions 6-392 Instruction code Pulse API Function Step 16-bit 32-bit instruction 1800 RS – – Transmitting the user-defined communication command 9 1801 FWD – – The AC motor drive runs clockwise. 7 1802 REV – – The AC motor drive runs counterclockwise. 7 1803 STOP – – The AC motor drive stops. 3 1804 RDST – – Reading the statuses of the AC motor drives 5 1805 RSTEF – – Resetting the abnormal AC motor drives 3 1806 LRC – Longitudinal parity check 7 1807 CRC – Cyclic Redundancy Check 7 1808 MODRW – – Reading/Writing the MODBUS data 11 1812 COMRS ─ ─ Sending and receiving communication data 11