Installation guide

Specifications 27
5.6.2 – Host Serial Port
This serial port is used to program the unit or communi-
cate with the host device. There are two serial interfaces
for the host port, RS232 and RS485. The RS232 inter-
face uses a 9-pin D female connector. The RS485 inter-
face connection is provided on a 6-position removable
terminal strip. The device that communicates with the
host computer can be either RS232 or RS485. This se-
lection is made with the 232/485 dip switch on the front
panel. MX2000 units can be daisy chained using the
RS485 interface. The Unit ID switch is used to set a
unique number for each unit for this purpose. This port
is referred to as Port #1 when used in a user generated
program.
The data format for serial communications is no parity, 8
data bits and 1 stop bit. The baud rate is switch select-
able for 4800, 9600, 19200 or 38400. The baud rate
switches and host device selection are only read on
power turn-on or when a RESET command is issued.
Dip switch Setting
232/485
switch
9.6
switch
19.2
switch
38.4
switch
Comments
232 ON OFF OFF Host communicates RS232, Daisy chaining is RS485, 9600 baud
232 OFF ON OFF Host communicates RS232, Daisy chaining is RS485, 19200 baud
232 OFF OFF ON Host communicates RS232, Daisy chaining is RS485, 38400 baud
232 OFF OFF OFF Host communicates RS232, Daisy chaining is RS485, 4800 baud
485 ON OFF OFF Host communicates RS485, Daisy chaining is RS485, 9600 baud
485 OFF ON OFF Host communicates RS485, Daisy chaining is RS485, 19200 baud
485 OFF OFF ON Host communicates RS485, Daisy chaining is RS485, 38400 baud
485 OFF OFF OFF Host communicates RS485, Daisy chaining is RS485, 4800 baud
Host RS485 Connector
Signal Name Description
GND Signal Ground reference
RX+ Differential receiver non-inverting input.
RX- Differential receiver inverting input.
TX+ Differential transmitter non-inverting output.
TX- Differential transmitter inverting output
SHLD Connection to Shield
Host RS232 Connector
Pin Signal Name Description
1 GND Signal Ground reference
2 TX MX2000 Transmitter terminal
3 RX MX2000 Receiver terminal
4 GND Signal Ground reference
5 GND Signal Ground reference
6-9 NC No connection
SHLD
100
TX+
TX-
RX-
RX+
GND
UART
OUT
IN
5
2
3
GND
TX
RX
RS232
RS485
Host Serial Port Equivalent Circuit
RS485 Position selected
RS232
RS232
RS485
RS485
TXEN
SHLD
100
TX+
TX-
RX-
RX+
GND
UART
OUT
IN
5
2
3
GND
TX
RX
RS232
RS485
Host Serial Port Equivalent Circuit
RS232 Position selected
RS232
RS232
RS485
RS485