Table of Contents
Advertisement
NTI KEEMUX Series PS/2 KVM Switch
RS232 CONTROL
(Optional)
RS232 Connections and Configuration
Remote Connection
The RS232 Interface (optional) is designed to meet the RS232C standard and can be controlled from any CPU or other controller
with an RS232 communications port. The pin-out for the DB-9 connector(s) on the unit is as follows:
RS232 CONNECTOR (DB-9 FEMALE)
PIN
SIGNAL
FUNCTION
1
CD
Carrier Detect
2
TXD
Transmit data (RXD at host)
3
RXD
Receive data (TXD at host)
4
DTR
Data terminal ready
5
GND
Signal ground
6
DSR
Data set ready
7
RTS
Request to send
8
CTS
Clear to send
9
-
No connection
Note: Security must be disabled or user access granted on the port(s) to be selected by RS-232 control.
On the DB-9 female connector, pins 1 (DCD), 4 (DTR), and 6 (DSR) are shorted and pins 7 (RTS) and 8 (CTS) are shorted.
Therefore, host handshaking is bypassed and TXD and RXD are the only active signals. A straight-through DB-9 serial cable (not
null modem- see specifications on page 26) will work for most CPUs. To daisy chain multiple units, a Matrix Y-1 cable is used
(see page 19) for each KEEMUX in the chain. The last unit in the chain should have DIP switch 1 ON (see table under "Unit
Address and Loop Back" on page 19).
Baud Rate
The baud rate can be changed by powering down the unit, changing the 8 position RS232 dip switch on the rear of the KEEMUX,
and then powering back up. This table shows how to set the baud rate.
DIP SWITCH
4
3
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
ON
OFF
ON
ON
ON
ON
BAUD RATE
2
OFF
300
ON
600
OFF
1200
ON
2400
ON
9600
OFF
ON
Rear View of KEEMUX-P4-RS
NTI
R
5VDC
2A
1275 Danner Dr
-
+
Aurora, OH 44202
www.nti1.com
Tel:330-562-7070
Fax:330-562-1999
OFF
1 2 3 4 5 6 7 8
ON
18
RS232
M
V
V
V
V
O
I
I
I
I
N
D
D
D
D
I
E
E
E
E
T
O
O
O
O
OFF
O
1 2 3 4 5 6 7 8
4
3
2
1
R
ON
Mouse
C
C
C
C
Keyboard
P
P
P
P
Daisy
Daisy
U
U
U
U
Out
In
4
3
2
1
CPU 4
CPU 3
CPU 2
CPU 1
PS/2 DEVICES
Advertisement
Table of Contents
