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RS232 CONTROL
(Optional)
RS232 Connections and Configuration
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 pin-out for the DB-9 connector on the unit can be found on page 7. A straight through DB-9
cable (not null modem) will work for most CPUs.
Baud Rate
The baud rate of the host CPU can be changed by using the menus in the RMTEST program (see "RS232 Interface Test
Program" below). The desired baud rate of 9600, 2400, 1200, or 300 may be set. A data protocol of 8 data bits, no parity, and 1
stop bit is used for communications.
Unit Address
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. In order to connect multiple KEEMUX units together a Matrix-Y-1 cable must be used. (See Fig. 6). See Fig. 7 for
the pinout of the Matrix-Y-1 cable.
CPU
Wiring Schematic of Matrix-Y-1 cable
9D Male
(Unit #1)
The baud rate of the KEEMUX is configured using dipswitches (see page 7).
RS232
Matrix-Y-1
Serial Port
RS232
NTI
SWITCH
First Unit
9D Female
(Source)
2
3
3
5
5
2
7
Jumper
8
1
4
Jumpers
6
Fig. 7
Matrix-Y-1
RS232
NTI
SWITCH
Second Unit
Fig. 6
9D Male
(Unit #2)
3
Not connected to
source connector
5
2
7
Matrix-Y-1
RS232
NTI
SWITCH
Last Unit
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