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Appendix ASpecifications
249
External Interface Specifications
Item Specification
Serial communication
Serial port A
Conforms to EIA RS-232C
D-SUB 9-pin connector (female)
+5 V (250 mA max.) output at pin No. 6
Serial
communication
Serial port B
EIA RS-232C or RS-422A/485 (selectable, by memory switch setting)
D-SUB 25-pin connector (female)
Parallel interface Conforms to Centronics standard, 20-pin half pitch connector
Expansion interface Dedicated connector
Note Check that the current capacity of the equipment to be supplied is within 250 mA before using the +5 V
output of pin No. 6. The +5 V output of the unit delivers +5 V " 5% and 250 mA maximum.
Programming Environment
Item Specification
Programming System Programming support software
Programming Tool Programming support software: NT-series Support Tool for Windows (Ver. 4.0), by OMRON
Special Features
Item Specifications
Buzzer
Three kinds of buzzer sound (continuous, short intermittent, and long intermittent)
ON: On reception of a command from the host, display of a screen with a
buzzer setting, or display of an error screen such as for a receive error.
OFF: On reception of a command from the host, or display of a screen with
no buzzer setting.
Setting: Set “ON” for “Buzzer Sound” in the memory switch menu, or set
“ERROR ON” for the buzzer to sound only when an error occurs.
The buzzer sounds three times in response to prohibited input.
Touch switch input sound
Touch switches
Input sound: Sounding for 0.2 seconds
Setting: Set “ON” for “Key Press Sound” in the memory switch menu.
Maintenance function
- Memory switch setting
- Self-test functions, such as for the memory and external interface
- Setting condition confirmation function
- Communication check function
- Initialization of internal memory data
- Display of display/alarm history data
- Registered data test display function
Battery backup
- Backup of numeral/character string memory table data in the NT31/NT31C
- Backup of display/alarm history data
- Backup of calendar and clock setting
Battery life: 5 years (at 25_C)
When voltage becomes low: RUN LED lights in orange or red
The communication flag to the PC (BAT LOW) comes
ON (1).
Resume function
Retains the contents of the numeral/character string memory tables (i.e., they are not
initialized) when the power is turned ON, when the NT31/NT31C is reset, and when
the operation mode is changed.
Setting: Set “ON” for “Resume Function” in the memory switch menu.