Omega Vehicle Security TCIC - Manual (Page 39)

TCIC User’s Manual
37
7. Specifications
7.1 Power Supply
5.0 VDC ±5% from either external supply via DC jack or from USB Bus,
jumper selectable.
7.2 Communication Ports
7.2.1 USB
Either USB bus powered or locally powered.
Compatible with USB 2.0 and USB 1.1.
Up to 921,600 baud using either direct or VCP (Virtual COM Port) driver.
7.2.2 RS232/RS485 (option)
Available on a 9 way D connector.
RS232 allows connection to PC with “straight through” 9D-9D lead cable
RS485: Half duplex (2 wire)
Jumper option to terminate line with 120 Ohms
Up to 25 TCIC boards may be connected to one RS485 bus
Factory set baud rate of 115,200 baud
7.3 Analog Inputs
8 fully differential inputs for connection to floating thermocouples or floating millivolt sources.
Full scale differential input is ±500millivolts. Open thermocouple detection on each channel.
Connection is via 2 off, 10 way screw terminal connectors. 3.81 mm pitch
Bias current:
120 nA
Maximum allowable input voltage:
±10 Volts relative to the GND terminal
Common mode input range:
+0.25V to +4.0V relative to the TCIC GND terminal.
ADC Internal Resolution:
24 bits.
ADC Noise free resolution: Noise of 1 microvolt rms,
giving ENOB = 20 bits on ±500 mV
or ENOB = 15.9 bits for a type K thermocouple
ADC Sampling rate:
400 Hz (50 Hz for each channel)
Millivolt accuracy:
Uncalibrated ±0.05%
Gain drift 5ppm/˚C typical, 10ppm/˚C maximum