2.4 Command List
2 – 7
Flexible (default) control mode
G
Serial control lockout and logic-level control lockout are both dis-
abled, and either may control the shutter blade position.
This is the default control mode, and is always selected after the
shutter head is reset.
2.4.3
Communication control commands
Enable assertive mode
L
Places the shutter in assertive communication mode.
Under normal operation, the shutter head will never initiate com-
munication over its serial interface; it will only respond to queries.
When assertive mode is enabled, the shutter head will actively re-
quest communication—by issuing a Serial Break character—if a “fa-
tal” fault occurs. The fatal faults are those that will trip the shutter
into the standby state: temperature, 12 V, position, and motor fail-
ures. A fatal fault can also be simulated by issuing command
O
.
While this mode is enabled, all queries that request data are ignored.
This mode is disabled by either issuing command
M
or by a hard
reset, either with command
C
or by removing power (
§
1.1.5).
Disable assertive mode
M
Disable assertive communication mode.
If assertive mode is currently enabled, this command will turn it o
ff
and restore the ability to communicate normally with the shutter
head.
SR475 and SR476 Laser Shutters
