Extron Electronics DXP Series - Manual (Page 37)

Programmer’s Guide, cont’d
Digital XPoint Matrix Switchers • Programmer’s Guide 4-2
Programmer’s Guide
The switcher’s rear panel RS-232/422 9-pin D female connector (figure 4-1) can be
connected to the RS-232 or RS-422 serial port output of a host device such as a
computer running the HyperTerminal utility, an RS-232 capable PDA, or a control
system. This connection makes software control of the switcher possible.
Female
5 1
9 6
Male
1 5
6 9
RS-232 Function Pin
1
2
3
4
5
6
7
8
9 —
TX
RX
—
Gnd
—
—
—
—
Not used
Transmit data
Receive data
Not used
Signal ground
Not used
Not used
Not used
Not used
RS-422 Function
TX-
TX+
RX+
RX-
Gnd
—
—
—
—
Transmit data (-)
Transmit data (+)
Receive data (+)
Receive data (-)
Signal ground
Not used
Not used
Not used
Not used
Figure 4-1 — Remote connector pin arrangement
The protocol is as follows:
• 9600 baud • no parity
• 8-bit, 1 stop bit • no flow control
If your Digital XPoint Series switcher was previously set up for RS-232, and
your computer comm port uses RS-422, you must change the switcher cabling
to match the computer interface. See chapter 6, Maintenance and
Modifications, for the procedure for swapping the serial ports.
Host-to-Switcher Instructions
The switcher accepts SIS (Simple Instruction Set) commands through the
RS-232/RS-422 port and Ethernet 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.
Switcher-Initiated Messages
When a local event such as power-up or a front panel operation occurs, the
switcher responds by sending a message to the host. The switcher-initiated
messages are listed below (underlined).
(C) Copyright 2001, Extron Electronics “DXP88”, Vx.xx
The copyright message is initiated by the switcher when it is first powered on.
Vx.xx is the firmware version number.
Password:
The switcher initiates the password message immediately after the copyright
message when the controlling system is connected using TCP/IP or Telnet and the
switcher is password protected. This message means that the switcher requires an
administrator or user level password before it will perform the commands entered
via this link. The switcher repeats the password message response for every entry
other than a valid password until a valid password is entered.