error_code = eMBMasterReqReadHoldingRegister(
SLAVE_ADDR, /* salve address */
MB_SEND_REG_START, /* register start address */
MB_SEND_REG_NUM, /* register total number */
RT_WAITING_FOREVER);/* timeout */
用串口调试显示发送16进制:
01 03 00 02 00 02 65 CB 00
其中正确命令为:01 03 00 02 00 02 65 CB
后面多两个00
不知道为什么?