Echelon LNS DDE Server - Manual (Page 101)

bcast_d.msg_out[.msg_code][parameters]
Where each component has the following meaning:
bcast_d
Required. bcast_d is a keyword, not a user-defined name.
This keyword is case insensitive.
msg_out Required. msg_out is a keyword, not a user-defined name.
This keyword is case insensitive.
msg_code Optional. Specifies sending messages with the given
message code, in decimal. Application message codes are
from 0 to 62. Foreign frame message codes are from 64 to
78. Do not specify message codes outside this range. If a
message code is specified, then the item data contains just
the message. If a message code is not specified, then the
first byte of the item data must contain the message code.
Parameters Optional.
The parameter options are:
-p bool
Specifies whether the message should be sent with priority
service. May be set to True or False. If not specified, the
default value specified in the Messaging Options
configuration dialog is used.
-r nn Specifies the retry count to be used for acknowledged and
request/response service or the repeat count to be used for
repeated service, where nn is a number between 0 to 15. If
not specified, the default value specified in the Messaging
Options configuration dialog is used.
-s service Specifies the service type to use when sending the message.
May be set to UNACKD (unacknowledged) or UNACKD_RPT
(repeated). If not specified, the default value specified in
the Messaging Options configuration dialog is used.
LNS DDE Server User's Guide 7-9