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NTI UNIMUX
RS232 CONTROL
RS232 enables the UNIMUX to be remotely controlled via RS232. To control the UNIMUX via RS232 the user has three options:
•write a program that runs on a PC using the Command Protocol (page 31)
•use the Matrix Switcher's Control Program (page 32) provided on the CD
•use the SerTest or RMTEST programs (pages 32 and 34) provided on the CD
Remote Connection
The RS232 Interface is designed to meet the RS232C standard and can be controlled from any host CPU or other controller with an RS232 communications port. The
RS232 Connector (DB9 FEMALE)
PIN | SIGNAL | FUNCTION |
1 | None | no connection |
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2 | TXD | Transmit Data (RXD at host) |
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3 | RXD | Receive Data (TXD at host) |
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4 | DSR | Data Set Ready |
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5 | GND | Signal Ground |
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6 | DTR | Data Terminal Ready |
7 | CTS | Clear to Send |
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8 | RTS | Request to Send |
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9 | none | no connection |
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NOTE: Security must be disabled or user access granted on the port(s) to be selected by
On the DB9 female connector, pins 1 (DCD), 4 (DTR), and 6 (DSR) are shorted and pins 7 (RTS) and 8 (CTS) are shorted. Therefore, CPU handshaking is bypassed and TXD and RXD are the only active signals. A straight through
Baud Rate
The baud rate can be changed by selecting MENU on the front panel keypad. Then select 1 for SET BAUD RATE and select the desired baud rate of 9600, 4800, 2400, or 1200. A data protocol of 8 data bits, no parity, and 1 stop bit is used for communications.
Unit Address and Daisy chaining
To allow multiple units to be controlled from a single host port, the RS232 control interface is designed to allow "daisy chaining" up to 15 units using an NTI
To set the unit address;
1.select MENU on the front panel keypad,
2.select 2 for SET UNIT ADDRESS,
3.type the address number
4.press <ENTER> on the front panel keypad.
RS232 | |||
CPU Serial Port |
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RS232 | RS232 | RS232 |
NTI | NTI | NTI |
SWITCH | SWITCH | SWITCH |
First Unit | Second Unit | Last Unit |
Figure 34- RS232 connection with Matrix-Y-1 cable
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