Extron Electronics CrossPoint 300 Series - Manual (Page 73)

4-3 CrossPoint 300 Matrix Switchers • Programmer’s Guide
Front panel Configuration port
This port is hardwired for RS-232 only.
The optional 9-pin D to 2.5 mm mini jack TRS RS-232 cable, part #70-335-01
(figure 4-2) can be used for connection to the Configuration port.
6 feet
(1.8 m)
Part #70-335-01
5
1
9
6
Sleeve (Gnd)
Ring
Tip
9-pin D Connection TRS Plug
Pin 2 Computer's RX line Tip
Pin 3 Computer's TX line Ring
Pin 5 Computer's signal ground Sleeve
Figure 4-2 — Optional 9-pin TRS RS-232 cable
This port is independent of the rear panel Remote port and is not affected by
changes to the rear panel port’s protocol. This front panel port’s protocol can
be changed, under SIS command control only. See the Command/Response
table for IP SIS commands, later in this chapter, to configure both ports under
SIS control.
Host-to-Switcher Instructions
The switcher accepts SIS (Simple Instruction Set) commands through either serial
port. SIS commands consist of one or more characters per command field. They do
not require any special characters to begin or end the command character sequence.
Each switcher response to an SIS command ends with a carriage return and a line
feed (CR/LF =
), which signals the end of the response character string. A string
is one or more characters.