Uses function code 03 (Hex.) to read the contents of a maximum of 16 holding registers. Table 1 shows example messages when the drive reads status signal from the drive of slave 2, the error contents, fault contents, and frequency references. Table 1. Message Example When Reading the Contents of Holding Register Byte Command Message Setting Data (Hex.) Response Message (Normal) Setting Data (Hex.) Response Message (Fault) Setting Data (Hex.) 0 Slave address 02 Slave address 02 Slave address 02 1 Function code 03 Function code 03 Function code 83 2 Starting No. Upper 00 Data Qty 08 Error code 03 3 Lower 20 First storage register Upper 00 CRC-16 Upper F1 4 Data Qty Upper 00 Lower 65 Lower 31 5 Lower 04 Next storage register Upper 00 - 6 CRC-16 Upper 45 Lower 00 - 7 Lower F0 Next storage register Upper 00 - 8 - Lower 00 - 9 - Next storage register Upper 01 - 10 - Lower F4 - 11 - CRC-16 Upper AF - 12 - Lower 82 -