C.3 Communication Specifications C.3 Communication Specifications MEMOBUS/Modbus specifications appear in the following table: 188 SIEP C710606 33A OYMC AC Drive – J1000 User Manual Item Specifications Interface RS-422, RS-485 Communications Cycle Asynchronous (Start-stop synchronization) Communication Parameters Communication Speeds Available 1.2; 2.4; 4.8; 9.6; 19.2; 38.4 kbps Data length 8 bit (fixed) Parity Select even, odd, or none Stop bit 1 bit (fixed) Protocol MEMOBUS/Modbus (using RTU mode only) Max Number of Slaves 255 drives (RS-485)