changed the default baud 1M->2M in OP3 Lib.
#define DXL_NODE_OP3_ID 200 // 0xC8
#define DXL_NODE_OP3_MODLE_NUMBER 0x7400
#define DXL_NODE_OP3_FW_VER 0x02
-#define DXL_NODE_OP3_BAUD 3
+#define DXL_NODE_OP3_BAUD 4
