Curtis Instruments 1351 User Manual

5 — VEHICLE CONTROL LANGUAGE (VCL)
pg. 97
Return to TOC Curtis Model 1351 – December 2018
CREATING AND USING CAN MAILBOXES (VCL SETUP)
CAN Mailboxes are where the 1351 operating system (OS) stores, sends and receive information over
the CANbus. Since there is a limited number of Transmit (TX)
1
and receive (RX)
2
buers and masks,
CAN mailboxes must be rst allocated. e OS provides a handle for each allocated mailbox, which
allows the VCL program to dene the mailbox, set it up and use it.
e 1351’s CAN mailbox functions are the same as for the Curtis F-series controllers, and are thus
dierent than the E/SE series of controllers. e 1351 System Controller diers in the fact it has two
CAN ports that share the available mailboxes and PDO setups between CAN port 1 and CAN port 2.
ere are four TPDOs
3
and four RPDOs
4
shared between Port 1 and Port 2. Twenty mailboxes are
available.
In Addition to the normal F series CAN mailbox setup functions, the 1351 oers specic functions
to simplify setting up mailboxes for the CANopen protocol. (e VCL writer may still use the normal
VCL mailbox functions for other protocols or if you require features outside these CANopen specic
functions)
If a CANopen function is used to start the setup of a CAN mailbox, the VCL writer must use only these
CANopen functions for that mailbox. Likewise, these CANopen functions cannot be used with the
normal CAN mailbox function
1
RX (Server to Client), as per CANopen nomenclature. Messages from the master controller to the slave controllers/devices
2
TX (Client to Server), as per CANopen nomenclature. Messages from the slave controllers/devices to the master controller
3
RPDO Receive Process Data Object (RPDO). Data received by the Consumer from Producer communication, (e.g., the master
controller receives PDO data from the slave controller).
4
TPDO Transmit Process Data Object (TPDO). Data transmission by the PDO Producer to PDO Consumer, (e.g., the slave controller
transmits PDO data to the master controller).
Reminder: TX and RX are from the perspective of the slave-device, as per CANopen specifications.

Curtis Instruments 1351 Specifications

General

Brand	Curtis Instruments
Model	1351
Category	I/O Systems
Language	English