Vaisala MMT330 - Manual (Page 176)

User's Guide _______________________________________________________________________
174 __________________________________________________________________ M210733EN-G
Measurement Data (Read-Only)
Table 36 Measurement Data Registers
Name Float Integer Unit
T 0003…0004 0258 (×0.01) °C
a
w
0029…0030 0271 (×0.0001)
H
2
O 0035…0036 0274 (×1) ppm
Available measurements depend on the instrument configuration. Values
may be unavailable also in case of device failure. Read status registers or
exception status outputs to check for failures.
NOTE Only real-time data can be read from the instrument. Data that is
recorded in the transmitter’s memory (internal memory or data logger
module) cannot be read through Modbus.
Status Registers (Read-Only)
Table 37 Status Registers
Name Address Description
Fault status 0513 1 = No errors
Online status 0514 1 = Online data available
Error code (bits 15…0) 0516 Bit field that represents the
error codes listed in Table 30
on page 146. Active errors are
set to 1. For example, if bit 14
is set to 1, error code E14 is
active.
Error code (bits 31…16) 0517
Error information can retrieved also with function code 08, sub-function
02.
NOTE Basic status information of the MMT330 transmitter is also available
with the Read Exception Status function code 07. For details, see section
Exception Status Outputs on page 175.