Model 2425 DAC Multiplexer

Model 2425 DAC Multiplexer

Product Support

Connects up to eight 8-channel chart recorders.
Optional expansion card, allows interconnecting up to 32 units serially and/or 4 units in parallel.
Serial copper and Fiber-optic links.

Overview

The DAC Multiplexer chassis enables up to six Telemetry Data Processors to send serial DAC and Discrete data messages to up to eight 8-channel chart recorders (a total of 64 channels). With an optional expansion card, you can interconnect up to 32 DAC Multiplexer chassis in serial configuration (1 station) and 4 stations in parallel, thus enabling up to 12 TDPs to share up to 256 8-channel recorders. This allows the strip chart channels to be shared by up to 12 telemetry front end processors, with each one having access to any or all channels, thus enabling the strip charts to be easily re-allocated to if a strip chart fails.

The serial interface allows the strip charts to be located up to 100 feet from a TDP chassis when using copper links, and up to 1000 feet with the fiber-optic link. Chassis options provide various combinations of copper and fiber-optic links.

A second option card receives and regenerates IRIG B timecode, slow code, and the front panel PAPER RUN switch, providing these signals on eight separate RJ45 connectors, or one for each strip chart recorder. Serial input messages are generated by the Acroamatics 1602P, 1605P, and 505V cards (over copper wire links), and by the 482M mezzanine DAC card over a fiber-optic link.

The Model 2425 DAC Multiplexer chassis with an expansion chassis is shown in the block diagram on the next page. The performance specifications appear on the page following

Technical Specs

FUNCTIONS
Inputs	The Model 2425 provides four serial inputs, and comes with either 5-megasample-rated fiber for operation to 1000 feet, or 6-megasample-rated copper wire for operation to 100 feet. The expansion option adds two input channels and three transmit channels, which allows up to 32 2425s to work serially and/or 4 units in parallel.
Calibrator	Allows all D to A outputs to be set to �5V, +5V, or to a step calibration with 10 output levels.
ANALOG OUTPUT (Output loaded with 10k Ohm and 50pf in parallel)
Resolution	12 bits of resolution, 2's complement binary input
Accuracy	Plus or minus 2 LSB
Linearity	Plus or minus 1 LSB
Stability	10ppm per degree C
Settling Time	2.5 microseconds to within plus or minus1 LSB
Slew Rate	3 Volts per microsecond
Output Current	1 mA maximum @\(+-5V
Output Voltage	-5V to +5V
DISCRETE OUTPUT
Outputs	64 discrete output lines, all TTL Compatible
Addressing Modes	The discrete outputs may be addressed as four 16-bit registers, eight 8-bit registers, or 64 1-bit registers. When selected as 16-bit registers, you can use strobe and acknowledge signals to synchronize message transfers
Output current	32ma @2.4V, and 48ma @ 0.40V
PHYSICAL
Power	104-125VAC standard, 47-63Hz, 3A max. 100/120/220/440 VAC supplies are also available
Dimensions	3.48�(8.84cm)H x 19.0�(48.26cm)W x 20.19�(51.28cm)D
Temperature	Operating 0� to +40� C, Non-Operating -40� to +86� C
Relative Humidity	Up to 90% non-condensing
Shock	Operating 6G, Non-Operating 50G
Vibration	Operating 0.5G, 5 to 2000Hz, Non-Operating 1.2G, 5 to 500Hz
specifications subject to change without notice