Measurement Computing USB-SSR08 - Manual (Page 12)

USB-SSR08 User's Guide Installing the USB-SSR08
Remove from the enclosure to access the on-board 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
Configure switch S1 to set the type of each module group for input or output. By default switch S1 is shipped
with all modules configured for output, as shown in . Figure 2-2
Figure 2-2. I/O module type switch (S1)
CH
CL
OUT IN
S1
You cannot mix input and output modules within a group.
Control logic polarity
Configure switch S2 to set the control logic polarity for each module group for inverted (active high) or non-
inverted (active low, default) logic. By default, this switch is shipped with all banks configured for non-inverted
logic, as shown in Fi
. gure 2-3
Figure 2-3. Relay logic switch (S2)
CH
CL
INVERT
NON
INVERT
S2
ƒ For input modules,
invert mode returns a "1" when the modules are active. Non-invert mode returns a "0"
when the modules are active.
ƒ For output modules,
invert mode allows you to write a "1" to activate the module. Non-invert mode allows
you to write a "0" to activate the module.
Relay power-up state
Configure switch S3 to set the state of the output relays at power-up. By default, this product is shipped with the
switch for all banks configured for pull-up (modules inactive on power-up), as shown in . When
switched to P/DN (pull-down), modules are active on power-up. Switch settings can be read back via software.
Figure 2-4
Figure 2-4. Relay power-up state switch (S3)
CH
CL
P/DN P/UP
S3
2-3