On page 209/210, it calls out that the default communicated mode is secondary mode, which doesn't correspond directly to the actual value, but to a calculated value, which you'd have to do the math to get back out the right value.
Edit: Or switch the mode to primary mode to make life easier (as long as it doesn't mess with other functioning of the meter, which searching the manual, it looks like it only changes the Modbus comms reading format).