SNAP-SCM-W2 OPTO 22, SNAP-SCM-W2 Datasheet - Page 9

• Manufacturer Part Number: SNAP-SCM-W2
• Description: I/O Module
• Manufacturer: OPTO 22

Specifications of SNAP-SCM-W2

• Accessory Type: 2 Channel RS-485 Serial Communication Module
• Leaded Process Compatible: No
• Peak Reflow Compatible (260 C): No
• For Use With: Snap I/O Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

3. Position the module over the
4. Push straight down on the module
Bias and Termination
(SNAP-SCM-485-422 and
SNAP-SCM-PROFI Only)
If you are using the SNAP-SCM-485-422 or
SNAP-SCM-PROFI,
the top of the module to provide bias or
termination on the RS-485/422 or PROFIBUS
DP network as required. Bias and termination
switches are shown in the diagrams at right.
Termination
If the port is physically the first or last device
on the network, provide termination as
follows:
SNAP-SCM-485-422—Move the Term
switch to ON.
SNAP-SCM-PROFI—If you are using an
official PROFIBUS cable, termination is
provided in the cable; therefore, switch the
termination to ON in the cable and move the
Term switch to OFF in the SNAP-SCM-PROFI
module.
Bias
Provide bias at one point on the network
by moving both the Pull Up and Pull Down
switches to ON.
connector on the rack, aligning the
small slot at the base of the module
with the retention bar on the rack.
If it is next to another module, make
sure the male and female module
keys are aligned, as shown at right.
to snap it into position.
If you need to remove the module,
see
page
29.
use the small switches on
SNAP Serial Communication Module User’s Guide
SNAP SERIAL COMMUNICATION MODULE USER’S GUIDE
Communication
Switches
Serial Port
Transmit
Run
SNAP-SCM-485-422
SNAP-SCM-PROFI
Power
Receive
OFF
ON
Pull Up Resistor
Termination
Pull Down Resistor
Not Used