Counter Terminal (Ctr); Power Terminal (+5V); Synchronizing Multiple Units - Measurement Computing USB-3102 User Manual

USB-3102 User's Guide
Configure as an output (master mode) to send the internal D/A LOAD signal to the SYNCLD pin.

You can use the SYNCLD pin to synchronize with a second USB-3102 and simultaneously update the
DAC outputs on each device. Refer to
Use InstaCal to configure the SYNCLD mode as master or slave. On power up and reset the SYNCLD pin is set
to slave mode (input).

Counter terminal (CTR)

The connection (pin 52) is the input to the 32-bit event counter. The internal counter increments when the
CTR
TTL levels transition from low to high. The counter can count frequencies of up to 1 MHz.

Power terminal (+5V)

The connection (pin 56) draws power from the USB connector. This terminal is a +5V output.
+5 V
Caution! The +5V terminal is an output. Do not connect to an external power supply or you may damage
the USB-3102 and possibly the computer.

Synchronizing multiple units

You can connect the
configuration and simultaneously update the DAC outputs of both devices. Do the following.
1. Connect the SYNCLD pin of the master USB-3102 to the SYNCLD pin of the slave USB-3102.
2. Configure the SYNCLD pin on the slave device for input to receive the D/A LOAD signal from the master
device. Use InstaCal to set the direction of the SYNCLD pin.
3. Configure the SYNCLD pin on the master device for output to generate an output pulse on the SYNCLD
pin.
Set the Universal Library
information on how to configure the USB-3102 with the Universal Library.
When the SYNCLD pin on the slave device receives the signal, the analog output channels on each device are
updated simultaneously.
An example of a master/slave configuration is shown here.
Configure the SYNCLD
Synchronizing multiple units
terminal pin (pin 49) of two USB-3102 units together in a master/slave
SYNCLD
option for each device. Refer to the Universal Library Help for
SIMULTANEOUS
D/A LOAD signal
Master
Slave
S
PMD-1608F device
(terminal pin 49)
pin for output
Figure 9. Synchronizing the update of multiple devices
SYNCLD pin
Configure the SYNCLD
pin for input
14
Functional Details
below.
Slave
device