dataTaker DT80 - Channel Options; Overview

UM-0085-B09 DT80 Range User Manual Page 41
RG
System
Variable
Function Notes Writable
26SV
Status of last NTP attempt
0 = no NTP requests have been attempted
1 = time adjustment in process
2 = last request successful
-1..-5 = last request unsuccessful
27SV
Time discrepancy as at last NTP request
in milliseconds
29SV
Status of last unload attempt
0 = no unloads have been attempted
1 = unload in progress
2 = last unload was successful
-10..-19 = destination store file error
-20..-29 = source store file error
-30 = communications queue is full
-99 = unload aborted by user

30SV
Number of logged data records for RX schedule
-1 = no current job; or no storefile has been
created for the specified schedule in the current job
31SV
Number of logged alarm records for RX schedule
32SV
Number of logged data records for RA schedule
33SV
Number of logged alarm records for RA schedule
↓
52SV
Number of logged data records for RK schedule
53SV
Number of logged alarm records for RK schedule
80SV
Communications session state
see Modem States (P217) (DT8xM models only)
81SV
Result of last communications session
see Communication Errors (P217) (DT8xM models only)
82SV
Last sampled mobile network signal level
value in dBm, typical range -113 to -51 (DT8xM models only)
83SV
Last sampled mobile network type
see Service Type (P220) (DT8xM models only)
84SV
Last sampled mobile network bit error rate
value in % (DT8xM models only)
85SV
Current Ethernet communications state
0 = disabled/no cable
1 = starting
2 = online
3 = limited connectivity (link-local IP address)
Table 4: DT80 System Variables
Channel Options
Overview
All channel types can be modified in various ways by channel options, which define the way in which the input channel
is managed when sampled. There are channel options that specify the type of sensor excitation, the termination of the
input channel, scaling and linearization of the input signal, the format and destination of channel data, fixed channel gain
values, resistance and bridge wiring methods, statistical operations on the channel data, and so on.
As shown below, channel options are placed in round brackets immediately following the channel ID (channel number
and type). If multiple channel options are specified then they should be separated by a comma (no spaces).
RA2S 1TK 3R(4W) 2*V(0.1,GL3V,"Speed~km/h",FF0)
In the above example:
• The first channel, 1TK, has no channel options specified so it will measure the thermocouple using default
settings.
• The second channel (3R) includes the 4W channel option, which specifies that a 4-wire resistance
measurement should be taken.
• Finally, the 2*V channel is in this case used to read a speed sensor which outputs a voltage that is directly
proportional to speed (10mV per km/h). The
0.1 channel option is the channel factor, which for a voltage
channel is interpreted as a simple scaling factor (mV * 0.1 = km/h). The
GL3V (gain lock) option tells the DT80
to select the 3V measurement range (rather than auto-ranging). The last two options concern the presentation
of the data on the LCD display and in returned real-time data when in free format (/h) mode. In particular, they
define the channel name and units, and specify that no decimal places be displayed (
FF0).
The channel's data will therefore be returned/displayed as:
Speed 72 km/h
instead of the default:
2*V 721.3 mV
Only certain channel options can be applied to each channel type. If an inappropriate channel option is applied (or an
incompatible combination of options), the DT80 notifies by returning an E3 - Channel option error message.