Crestron SW-SIMPL Installation & Operating Manual page 135

Crestron SIMPL™ Windows
Installation & Operations Guide – DOC. 5728C
address to the list of entries. To change an entry, select it and click Modify; to
remove an entry, select it and click Delete. Use the Copy command to make minor
modifications to an entry without need to re-type all the information. To connect to
an IP address, select it and click Connect.
Some IP addresses (usually hosts on the Internet) have associated domain names.
The DNS Lookup command retrieves the domain name, if any, of the current IP
address.
The Wait for Connection command causes the Viewport to listen for a TCP/IP
connection to be initiated from another control system or computer. Enter the port
number and click OK. To take Viewport out of listening mode, click Cancel.
PC Passthrough
PC Passthrough refers to a communication method whereby a remote PC connects
to a local control system by using a local PC as a bridge. This is typically used in
troubleshooting situations where a programmer must access a customer's control
system from outside the customer's LAN. Since the control system is likely to be
protected behind a firewall, Ethernet access will not be possible; and depending on
the location of the control system, a physical link using serial cables may not be an
option either.
In this scenario a local PC can establish communication with the control system
using RS-232 or TCP/IP, as usual. The local PC would then enter PC Passthrough
mode. The remote PC then connects to the local PC, usually via modem, enabling the
remote PC to communicate with the control system just as if a direct connection
existed.
Local PC Settings
To enter PC Passthrough mode, click PC Passthrough and specify the type of
connection that will be established with the remote PC. In the scenario just
described, this will a modem connection, although TCP/IP and direct RS-232 are
also available options.
To specify a modem connection click RS-232 to enable the serial settings options.
Click Modem as the connection type and select the COM port where the modem is
installed. (Note that the initialization string issued to the modem is specified in
Modem Settings on the Viewport Setup menu. For PC Passthrough, the string is
given in the PC Passthrough Initialization String field. Viewport provides default
initialization strings that are standard for most modems.)
Next, select the PC settings for baud rate, parity, and the number of data bits and stop
bits. (In most cases the default settings, N, 8, 1 be kept.) Click Start to begin PC
.
Passthrough mode
To specify an RS-232 connection, click RS-232 and then choose Direct. Select the
appropriate COM port on the PC and then select the other serial communication
settings. (Here again the default settings can be kept in most cases.) Click Start to
begin PC Passthrough mode.
Finally, to specify an Ethernet connection, simply click TCP/IP, and then click
Start. The PC will listen for a connection from the remote PC.
Remote PC Settings
Once the local PC is brought into PC Passthrough mode, the remote PC can establish
communication as follows:
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