Specifications
Serial Communications Interface
•
Serial Port:
Opto-isolated Matlabs type LTC491 Transmitter/Receiver. Compatible
with RS485 specification. Up to 32 drivers and receivers allowed on the
line. I/O bus programmable from 00 to FF hex (0 to 255 decimal).
Whatever address is assigned is stored in EEPROM and used as default
at next Power-On.
•
Asynchronous Data Format:
7 data bits, even parity, one stop bit.
•
Input Common Mode Voltage: 300V minimum (opto-isolated). If opto-isolators are
by-passed: -7V to +12V.
•
Receiver Input Sensitivity:
±200 mV, differential input.
•
Receiver Input Impedance:
12K
Ω
minimum.
•
Transmitter Output Drive:
60 mA, 100 mA short circuit current capability.
•
Serial Data Rates:
Programmable for 1200, 2400, 4800, 9600, 14400, 19200,
28800, and 57600 baud. Crystal oscillator provided.
Analog Outputs
•
Channels:
Eight independent.
•
Type:
12-bit, double-buffered.
•
Non-Linearity:
±0.9 LSB maximum.
•
Monotonicity:
±½ bit.
•
Output Range:
0-5V, ±5V, 0-10V.
•
Output Drive:
Low Power Option: 5 mA, High Power Option: 250 mA.
•
Current Output:
4-20 mA SINK (User supplied excitation of 5.5V-30V).
•
Output Resistance:
0.5.
•
Settling Time:
15 µsec to ±½ LSB.
Digital I/O
•
Seven bits configured as input or output.
•
Digital Inputs
Logic High:
+2.0V to +5.0V at 20µA max. (5mA max at 50V in)
Protected to 200 VDC
Logic Low:
-0.5V to +0.8V at 0.4 mA max. Protected to -140 VDC.
•
Digital Outputs Logic-Low
Sink Current: 350 mA maximum. (See note below.)
Inductive kick suppression diode included in each circuit.
Note
Maximum allowable current per output bit is 350 mA. When all seven bits are used, there is a
maximum total current of 650 mA.
•
High-Level Output Voltage:
Open Collector, compliance with up to 50VDC
user-supplied voltage. If no user supplied voltage exists,
outputs pulled up to +5VDC via 10 kΩ resistors.
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Manual MRDAG12-8H.Bc2