Next NI2400 User Manual page 71

9
DETAILED
SPECIFICATIONS
DIGITAL I/O
Digital Output
One relay output (for alarm, etc.): volt-free closure (low voltage 30V, 2A)
Two opto-isolated digital inputs
Max Input Voltage: 24V (max current: 10mA)
Digital Input:
Min Input Voltage: 5V (max current: 2mA)
Measurement Rate (MR): max frequency 1 kHz
Accuracy: 0.1 Hz
PROTECTIONS
Electro-Mechanical Relays for Measuring Each Channel:
Electrical Endurance: min 2 x 105 operations
Mechanical Endurance: 100 x 106 operations.
Circuit Protection (Gas Discharge Tubes):
DC Breakdown Voltage (@100V/s): 75V
Tolerance of DCBV: ± 20%
Impulse Breakdown Voltage (@100v/µs ): 250V
Impulse Breakdown Voltage (@1kv/µs ): 525V
Overvoltage and Reverse Polarity Protection
Short Circuit Protection on Every Output
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9
DETAILED
SPECIFICATIONS
INTERFACES
Display & Keyboard
LAN Ethernet Iso-
lated
RS232
USB
RS485#1
Opto-Isolated
RS485#2
Opto-Isolated
0140
Small backlight graphic LCD 128 x 64 dpi with membrane keyboard for the
minimal local management without the PC. Keyboard for starting a data
acquisition scan, sequential display of the last stored readings for each chan-
nel (sensor ID, converted unit reading, unit of measure), device status, data
download and firmware/Web pages update by USB pen drive, safe mode
(back-up/format/restore internal SD card).
10/100 Mbps, RJ45
9-pin, DE9: DCE port for optional GSM/GPRS modem connection
Baud Rates: selectable from 9600 bps to 115.2 kbps
Default Format: 8 data bits; 1 stop bits; no parity
USB 2.0 pen drive only (FAT 32), 5 V 200 mA
Connection: 5 screw clamp port for max. No.254 Modbus RS485 digital
bus sensors
Communication Interface: RS485
Communication Protocol: MODBUS RTU
Voltage 'V OUT': Switched on and off under program control. V OUT is
the unregulated input power supply 'V IN' (1 A).
Power supply management: Always on or energy safe
Connection: 5 screw clamp port for max. 16 multiplexer boards
connection.
Communication interface: RS485
Communication protocol: MODBUS RTU
Voltage 'V OUT': Switched on and off under program control. V OUT is
the unregulated input power supply 'V IN' (1 A).
Every channel of each multiplexer board is completely independent.
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0141