GEMTEQ I/O 5. GEMCAN SPECIAL FUNCTION
5.2.3
Y Rung Input – Module, Port & Node ID Selection
The Y Rung may be considered to be made up of 4 parts or nibbles:-
a b c d
Module No
range (1 to 2)
Port No
range (1 to 2)
Node ID
range (0 to 127)
Module No
The GEMCAN I/O Scanner module that the Command is to be actioned
by.
Port No
The Port number on the GEMCAN I/O Scanner module that the Command
is to actioned by.
Node ID
The Node Id of the slave device the GEMCAN network that the Command
is to actioned by.
5.2.4
X Rung Input - Command
The GEMCAN I/O Scanner module accepts two commands:-
Table 5-4
CANCMD – Command Data
Command Details
0 No
operation
1
Request mastership of the GEMCAN network
2
Request release of mastership of the GEMCAN
network
5.2.4.1 Request Mastership Command (1)
This is used when configured as a change over master, the GEMCAN I/O Scanner will transmit to
the active master a request to gain mastership of the GEMCAN network. If it is successful then
the master will be seen to go into the Operational state, by monitoring appropriate port statistics
see Table 8-1.
This command does not require and data to be passed to the device and no data will be returned
by the device, hence Zm+1 to Zm+4 should be left at zero.
5.2.4.2 Release Mastership Command (2)
The GEMCAN I/O Scanner will transmit to any other master a request for it to gain mastership of
the GEMCAN network. If it is successful then the master will be seen to go from Operational to
Pre-operational state, and this can be seen by monitoring the appropriate port statistics see Table
8-4.
This command does not require and data to be passed to the device and no data will be returned
by the device, hence Zm+1 to Zm+4 should be left at zero.
When a GEMCAN scanner has bus mastership the operational state (see Table 8-4) is set to
“operational”, the slave scanner state is set to “stopped”. If a change-over occurs then the above
GEMTEQ I/O Technical Manual (T2031En)
Page 5-4
Rev.02 (10/10)
Summary of Contents for GEMTEQ I/O GEM80
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