Specifications

Crestron e-control Mail SW-MAIL
63 •• Appendices Installation & Reference Guide — Doc. 5798
to the control system. All the symbols’ rx$ and tx$ streams are tied to the same
serial driver symbol. The set of signals intended for a particular Intersystem
Communications symbol are distinguished from the other sets by their offset and/or
their channel number.
Normally, the signals in an Intersystem Communication symbol’s input list and its
output list are internally enumerated starting at the top of each list with zero (0). The
next signal down the input list and the next down the output list are numbered 1; the
next pair, 2; and so forth. These “signal numbers” are transmitted along with the data
and are used at the receiving end to determine what to do with the data.
NOTE: The signal numbers under discussion here are for communications purposes only and are not
utilized in any way outside the Intersystem Communications symbol context. The numbering
scheme displayed on the Intersystem Communication symbols in SIMPL Windows has nothing to do
with the actual signal numbering.
Additional Intersystem Communications symbols using the same connection must
specify a value to offset their signal numbers by a constant amount. The top signals
in such an Intersystem Communications symbol do not begin with zero, but rather
with the supplied offset. This offset must be specified on both sides of the
connection, as follows.
On the server side, the offset is entered into the textbox in the upper right corner of
the signal block definition window. Note in the figure below that the textbox in
question is not labeled Offset as one might expect, but Signals. The adjacent box
labeled to shows the signal number of the last signal in the input or output lists
(whichever is higher). This information helps to determine the offset of the next
signal block.
The Signal Block Interface frame from a typical signal block definition window, showing the signal
block’s COM Settings, Vcom channel assignment, and signal offset.
NOTE: In the above example, Vcom channel is dimmed because “SYS” specifies a serial connection.
(Only TCP/IP connections have channels.)
On the control system side, in SIMPL Windows the offset is entered into the offset
textbox at the bottom of the Intersystem Communications symbol.
A portion of an Intersystem Communications symbol.
showing the Offset and Option textboxes.
NOTES: