OptoNews: Integrate CAN devices with your SNAP PAC System

Posted by Jean Femia on Jul 15, 2015 4:57:04 PM

SNAP-SCM-CAN2B_p_200Do you have devices on a Controller Area Network? Now you can communicate with them using the SNAP-SCM-CAN2B serial communication module and a new CAN RX/TX Integration Kit

New R2.0b firmware on the SNAP-SCM-CAN2B makes it possible to both transmit and receive data. 

When you enable transmit functionality, all data communications between the module and the SNAP PAC brain or controller are ASCII encoded and frame delimited for robust communications.

The new integration kit, part number PAC-INT-CAN-RXTX, is a free download. It helps you use PAC Control CAN-specific commands more easily by providing sample charts and subroutines that you can add to your own strategy and modify as needed.

A little history

Receive only. The SNAP-SCM-CAN2B was originally issued as a receive-only module (firmware R1.0d or lower), so some of you may already be using it. If you are, you don't need to change anything unless you want to transmit as well. Newer modules are backwards compatible, so you can add more modules if you need to. An older CAN integration kit works with modules that have firmware R1.0d or lower; it is for receiving data only. This older kit has a new part number, PAC-INT-CAN-RX (previously PAC-INT-CAN).

Transmit and receive. If you have an older module and now want to transmit as well as receive data, you can download the newer firmware and then follow steps in the PAC Manager User's Guide (form 1704) to update the firmware. Then you'll use the newer integration kit, PAC-INT-CAN-RXTX

Here's a chart that sums it up:

Purpose Use firmware Use integration kit
Transmit & receive R2.0b or higher PAC-INT-CAN-RXTX
Receive only R1.0d or lower PAC-INT-CAN-RX

Questions? Contact Opto 22 Product Support. 

See the CAN serial module

Topics: Updates, optonews, New products, Integrators, OptoNews 2015-07-15, I/O

Written by Jean Femia

Jean Femia writes about technical subjects and has focused on automation and control systems for more than 15 years. She likes learning about technology and taking corners in her Honda S2000.
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