Westermo GDW-11 - Manual (Page 299)

Appendixes 299 6615-2220
<error> Meaning Resulting from the
following commands
536 Class locked: a command has been All commands
launched from a port, the effect is
to lock all commands belonging to
the same class. If another port
launches a command of this class,
this error will occur as long as the
class is not released (at first
command’s completion time)
537 Phonebook group full. +CPBW
538 Not Enough Space to copy SMS +WMCP
539 Invalid SMS +CMGR
541 Open AT application and AT +WOPEN
software version do not match