Crestron C2COM-2 Operations & Installation Manual page 14

2-Series RS-232/422/485 Expansion Cards
10 • 2-Series RS-232/422/485 Expansion Cards: C2COM-2/3
SIMPL Windows prompts the user to replace the existing driver. Click Yes twice.
Now double-click the Canon driver in the system tree. The Serial Settings tab in the
"Device Settings" window displays the values for the Canon driver.
NOTE: Some serial devices in the Crestron Database have the same serial driver
settings as the SIMPL Windows default settings.
C2COM-2/3 Symbol in Programming Manager
Programming Manager is where programmers "program" a Creston control system
by assigning signals to symbols. The following illustrates the symbol associated with
the ports of the C2COM-3 in SIMPL Windows.
Detail View of C2COM-3 Device Symbol (Port A) in SIMPL Windows' Programming
Manager
The [tx$] (transmit) and [rx$] (receive) signals transmit serial data to and from the
COM port in whatever port or driver settings is specified for the device in
Configuration Manager. The protocol that a device expects will be described in the
manufacturer's documentation and includes the speed of communication (baud rate),
error checking (parity), the number of data bits and stop bits, and any hardware or
software handshaking that may be required to control the flow of data between
devices.
Some devices require a [break] to enable synchronization. The [break] input drives
the transmit pin of the associated COM port low (00 Hex at half the baud rate), thus
interrupting transmission of data. Some [break] signals can be 17 to 20 bits of logic
low, whereas others hold transmission low for as long as [break] remains high.
Again, the hardware documentation will contain information about the type of
[break] a device generates.
The [rts] (request to send) input and the [cts] (clear to send) output are hardware
handshaking signals for use in applications where explicit handshaking control is
required. These signals are enabled only when the Handshaking setting of the device
is set to RTS, CTS, or RTS/CTS in Configuration Manager.
Some serial driver symbols go beyond the basic serial drivers and have the added
capability to function as Serial I/O symbols. That is, in addition to the signals just
described, these symbols have an [enable] input, [str] and [delimiter] parameters,
and digital inputs and outputs. Together with [tx$] and [rx$], these signals function
identically to a Serial I/O symbol, except that the positions of the input and output
signals are reversed.
NOTE: Input and output lines in brackets ([ or ]) are considered optional and may
not be required in every SIMPL Windows program.
Crestron C2COM-2/3
Operations & Installation Guide - Doc. 8192