D E T A I L E D A R C H I T E C T U R E
Data Device Corporation
SB-3642 Manual
Rev D – 4/19
18
4.2.1 Sample Read Sequence
Write to inhibit channels, read position for that channel, and write to un-inhibit
channels. This process will prevent reading data in transition. See the SB-36030Sx
Software Manual for specific commands and explanations.
4.3 Additional Functionality
4.3.1 Self-Test
The device has a built-in self-test capability which can run a simulated test angle of 0,
45, or 90 degrees on each channel. Any channel not reporting back an answer within
±1
°
will fail.
4.3.2 Two-Speed Mode
Two-speed mode allows resolutions greater than 16 bits to be achieved. Two-speed
mode may be implemented for both static angles and rotations. The procedure to use
two-speed mode is described in Software Manual SB-36030Sx. For more information
on two-speed mode, refer to the Two-Speed Application Note (AN/MFT-10), the
RD/RDC Applications Manual (MN-19220XX-001) and the Synchro/Resolver
Conversion Handbook. These documents are available at
4.3.3 Discrete Digital I/O
Note: This feature is only available on the 4-channel board, SB-3624xF4.
The SB-3642 has 4 discrete inputs and 4 discrete outputs. Outputs are physically
driven by the output of the Darlington open-collector drivers. Output pins are opto-
isolated by opto-couplers whose output current sinking capability has been increased
using a discrete transistor connected in a Darlington configuration. The emitters of all
the output transistors are the pins labeled "DIO_Ext_GND" on the connector. The
Inputs are also referenced to these same pins. The opto-isolators provide up to 1500
Vac isolation for the discrete I/O on the card.
The discrete digital I/O can be used for a variety of applications including triggering
events, indicating status, or general purpose use.
Refer to SB-36030Sx Software Manual for Discrete I/O operation and control.
