Unfortunately the continuous mode is not documented in the manual. According to the output you received it looks like the integer value at the end of the line is the measurement value but without a documentation about that format that's just guessing.
Did you really configured 8O1 in F2.4? The default is 8E1 (which is also the ModBus default BTW). Please check that. You should at least remove the 8O1 for the serial to the PC because there you probably use 8N1.