Network Technologies SM-nXm-15V-LCD - Manual (Page 12)

NTI VEEMUX VIDEO MATRIX SWITCH
8
Scan Mode
Scan Mode causes an output port to automatically switch from one input port to the next consecutive input port after a specified
period of time (referred to as the dwell time). Port switching will continue indefinitely and no ports will be skipped, whether there
are video sources connected to them or not. If desired, the VEEMUX can be configured to skip the scanning of specific ports
using the RS232 Command Protocol (page 9) or Telnet (page 13).
Dwell time settings can be any value from 0 seconds (000) to 255 seconds. A setting of 000 seconds (the default setting)
disables Scan Mode for that output port. If Scan Mode is disabled for a specific port, then the video to that output will only
change as decided by the administrator.
To configure Scan Mode from the front panel LCD :
Press MENU, the following lines will be displayed:
1) Set Baud Rate
2) Set Unit Addr
Press MENU again, the following line will be displayed:
3) Set Scan Mode
Press 3 to select that menu item. The following request will be displayed:
Select Port
Select the output to be programmed using the numeric keys, then press ENTER. The display will show the current Dwell Time
value for that output and ask for a new value.
Current Time: 16
New Time:
Using the numeric keys, enter a value between 0 and 255 and press ENTER. Leading zeros are allowed (000) but the number
should not exceed 3 digits. The Scan Mode dwell setting value 0 will disable Scan Mode for that output port.
Scan Mode settings can also be configured through the RS232 Command Protocol (page 9), Telnet commands (page 13), or
through the Web Interface (page 18).
NOTE: Scan Mode configuration settings can only be saved if they are assigned a memory location via the Keypad
Control (page 7). Otherwise when the power is cycled to the VEEMUX, all Scan Mode settings will be erased.
TIP: If the Scan mode settings are stored as memory location 0, they will be loaded each time the VEEMUX is powered
ON.
RS232 Control
RS232 enables the VEEMUX to be remotely controlled via RS232. To control the VEEMUX via RS232 the user has three
options:
•
write a program that runs on a PC using the Command Protocol (page 9)
•
use the NTI Switch Control Program (page 11) provided on the CD
•
use the SerTest program (page 11) provided on the CD
Remote Connection
The RS232 Interface is designed to control the switch via serial (RS232) daisy chain connection from any host computer or other
controller with an RS232 communications port. There is, however, a restriction that must be followed:
The pin outs for the DB-9 connector on the unit are as follows:
RS232 Connector (DB-9 FEMALE)
PIN SIGNAL FUNCTION PIN SIGNAL FUNCTION
1 None no connection 6 DTR Data Terminal Ready
2 TXD Transmit Data (RXD at host) 7 CTS Clear to Send
3 RXD Receive Data (TXD at host) 8 RTS Request to Send
4 DSR Data Set Ready 9 none no connection
5 GND Signal Ground
NOTE: If Outputs Scanning Sequences (page 22)
Is enabled, Scan Mode as configured at the LCD
front panel will be disabled.