semaphore TBOX LT2-530 Series, User Manual, Page: 114 / 197

Version : 1.09 114
12.4. Recipients
To access the definition of Recipients, click the folder ‘Alarms’ in the Project workspace and select
‘Recipients’.
The types of recipients supported are:
Internal: the alarm is saved in the stack of events and no call is generated.
It can be used to memorize a particular event without generating an alarm or to test
an alarm condition.
ModBus: it can be Master or Slave.
It is used to establish a dial-up ModBus connection to another ModBus device or a
SCADA accepting unsolicited ModBus communication (for instance TView).
The difference between Master and Slave concerns the handling of the modem
connection and acknowledgement.
A ‘Slave’ connection means that
TB
OX
LT2
dials equipment and doesn’t do anything
else. The dialed equipment will sample, acknowledge and hang-up. Typically used for
instance when dialing TView.
A ‘Master’ connection means that
TB
OX
LT2
dials ModBus equipment and will also
sample this equipment (with Modbus Transactions).
TB
OX
LT2
will then be also responsible for acknowledgment (see chapter 8.5.2 System
Variables [8] AlaID or [10] AlaRec) and hanging-up (see ‘Advanced’ properties of the
communication port used to send the alarm).
A modem parameter: “Hang up
timeout” is used by ‘ModBus-Master’
alarm to define the maximum
connection time. The maximum value
is 600 seconds.
Value=0 means it will
never hang up!