Model TT231-0600
Two-Wire RTD Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 25 - http://www.acromag.com
- 25 -
http://www.acromag.com
Read Status…
For a 2-wire sensor, a break in the IN+ lead and/or IN- will return “Fault Code:3
(Positive Input Exceeds Positive Limit). A missing jumper between terminals 3 & 4
of the transmitter will return “Fault Code: 5 (Positive Input exceeds positive Limit
and Negative Input exceeds Positive Limit)”. The following table summarizes the
Fault Levels returned for a break or open in each of the input leads.
LEAD BREAK
2-WIRE FAULT
3-WIRE FAULT
4-WIRE FAULT
#1, M
NA
NA
Not Flagged
#2, IN+
3
3
3
#3, IN-
3
1
1
#4, L
NA
5
5
3-4 Jumper
5
NA
NA
Reset Unit
You can use
“Reset Unit”
to reset the transmitter and cause it to revert to its
power-up or last saved configuration. This will also clear a very rare checksum
error, which can occur if the transmitter fails to read its configuration from the
EEPROM properly, or if the EEPROM contents have been corrupted. A checksum
error will also send the output current to 0.4mA below the lowest under-scale
threshold setting, until reset via this control, or by toggling loop power OFF/ON. A
persistent checksum error could indicate a defective transmitter.
Restore Factory Settings
(Optional) Factory Settings…
You can use the “
Restore Factory Settings
” button to restore the transmitter
configuration to the original factory state (see Specifications Reference Test
Conditions), including the optional settings (over/under-scale & and break
detection). This control provides a potential recovery path should the configuration
ever become corrupted during recalibration, perhaps due to miscalibration. For
example, if during calibration you break the USB connection before completing
calibration, the EEPROM checksum value could be corrupted and this would inhibit
normal operation. Alternately, this button can be used as a sanitation tool to
restore the unit to its initial configuration. Note that the “Reset Unit” control of
Unit Status sends the unit to its power-up or stored configuration, different from
this control which sends the unit to its initial factory configuration.