Extron Electronics MPX Plus 866 A Rev. B - Manual (Page 27)

2-7 MPX Plus 866 A Media Presentation Matrix Switcher • Installation
PRELIMINAR
Y
Serial connections
l
RS-232 connectors — Connect one or two host devices, such as computers,
touch panel controls, or RS-232 capable PDAs to the switcher via these
3-pole captive screw connectors for serial RS-232 control (figure 2-7). Use the
supplied tie-wrap to strap the serial cable to the extended tail of the connector.
Function Pin
TX
RX
Gnd
Transmit data
Receive data
Signal ground
RS-232
PRIMARY
RS-232
SECONDARY
Tx Rx
Tx Rx
Controlling
Device
Ground ( )
Receive (Rx)
Transmit (Tx)
Ground ( )
Receive (Rx)
Transmit (Tx)
Bidirectional
Do not tin the wires!
Figure 2-7 — RS-232 connector
N The length of exposed wires is critical. The ideal length is 3/16 ” (5 mm).
• If the stripped section of wire is longer than 3/16 ”, the exposed wires may
touch, causing a short circuit between them.
• If the stripped section of wire is shorter than 3/16 ”, wires can be easily pulled
out even if tightly fastened by the captive screws.
N These two ports are hardwired for RS-232 only.
The RS-232 Secondary port is active only if the front panel Configuration port
is not in use. If a front panel configuration connection is made, the rear panel
RS-232 Secondary port becomes inactive and the front panel Configuration port
is active.
N The switcher can operate at 9600, 19200, 38400, or 115200 baud rates.
See “Selecting the RS-232 Primary port’s baud rate” in chapter 3, “Operation”,
to configure the RS-232 Primary port from the front panel.
See “Command/Response table for IP SIS commands”, in chapter 4,
“SIS Programming and Control”, to configure all ports under SIS control.
If desired, connect an MKP 2000 or MKP 3000 remote control panel to the
switcher’s RS-232 connector. Refer to the MKP 2000 Remote Control Panel
User’s Manual or the MKP 3000 Remote Control Panel User’s Manual for details.