Measurement Computing USB-SSR08 User Manual page 9

USB-SSR08 User's Guide
Remove from the enclosure to access the onboard switches
To change the configuration of a switch, you must first remove the USB-SSR08 from the enclosure. Turn
external power off before changing the switch settings
I/O module type
Use switch to configure the type of each module group for input or output. By default, switch S1 is shipped
S1
with all banks configured for output modules, as shown in Figure 3.
You cannot mix input and output modules within a group.
Control logic polarity
Configure switch
S2
inverted (active low, default) logic. By default, switch S2 is shipped with all banks configured for non-inverted
logic, as shown in Figure 4.
For input modules,

when the modules are active.
For output modules,

you to write a "0" to activate the module.
Relay power-up state
Configure switch
S3
banks configured for pull-up (modules inactive on power-up), as shown in Figure 5. When switched to
(pull-down), modules are active on power-up. Switch settings can be read back via software.
PULL DN
Figure 3. I/O module type switch (S1)
to set the control logic polarity for each module group for inverted (active high) or non-
Figure 4. Relay logic switch (S2)
mode returns a "1" when the modules are active.
invert
mode allows you to write a "1" to activate the module.
invert
to set the state of the output relays at power-up. By default, switch S3 is shipped with all
Figure 5. Relay power-up state switch (S3)
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Installing the USB-SSR08
mode returns a "0"
Non-invert
mode allows
Non-invert