ElmoMC CANopen DSP 305 Implementation Guide - Manual (Page 5)

LMT (Layer Management): Functions to inquire and change the settings of
certain parameters of the local layers on a CAL module.
LSS (Layer Setting Services): Functions to inquire and change the settings of
certain parameters of the local layers on a CANopen network. An LSS
Master can change the following parameters of LSS Slaves:
ƒ Node ID
ƒ Timing parameters of the physical layer (Baud Rate)
ƒ LSS address
The LSS Slave can be configured for a CANopen network without using
any hardware based devices such as DIP-switches.
LSS Master The device that configures other modules via a CANopen Network.
There may be only one LSS Master in a network.
LSS Slave The device that is configured by the LSS Master via a CANopen Network
is called the LSS Slave.
MAC (Medium Access Control): One of the sub-layers of the Data Link Layer
in the CAN Reference Model that controls who gets access to the
medium to send a message.
NMT (Network Management): One of the service elements of the application
layer in the CAN Reference Model. The NMT serves to configure,
initialize, and handle errors in a CAN network.
1.3 LSS Hardware Restrictions (LSS Address)
All LSS Slaves must support valid Object Dictionary entries for Identity object [1018h]
which has 32 bits for each part of the LSS Address:
ƒ Vendor-ID (numerical number)
ƒ Product-Code (numerical number)
ƒ Revision-Number (major an minor revision as numerical number)
ƒ Serial-Number (numerical number)
A Product-Code, Revision-Number and a Serial-Number are assigned by the device
supplier. The LSS address which must be absolutely unique. No other LSS slave may
have the same LSS address.
1.4 LSS Operating Restrictions
To function properly the following restrictions apply:
ƒ All devices on a CANopen network must support LSS.
ƒ There can be only one LSS Master.
ƒ All nodes are required to start-up with the same initial baud rate.
ƒ LSS communication can take place during any NMT state such as “stopped”
or "pre-operational".
CANopen DSP 305 Implementation Guide
MAN-CAN305IG (Ver. 1.1)
1-2