CSE-M73A User Manual Ver. 1.0
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1.5.2 RS422 and RS485 port (JP4 and JP5)
CSE-M73A has a port for RS422 or RS485. This port is interfaced with JP4 and JP5. The
pins which have the same number of JP4 and JP5 are connected each other. When you
connect your device, remember that a pin should be connected with the one which has the
same polarity. Of course, an output pin (Transmit-TX or TXD) has to be connected to an
input pin (Receive-RX or RXD).
Number
Name
Description
Level
I/O
Etc.
1
VCC
DC 5V Power
-
-
required
2
TRX+
(RS422) Transmit Data +
RS422
IN
required
(RS485) Data +
RS485
3
TRX-
(RS422) Transmit Data -
RS422
OUT
required
(RS485) Data -
RS485
4
GND
Ground
-
-
required
5
RX+
(RS422) Receive Data +
RS422
OUT
optional
6
RX-
(RS422) Receive Data -
RS422
IN
optional
Table 1-2 pin assignment of the RS422/485 port
In some environments, to prevent reflection wave, two terminal resistors may be
needed at the end of the RS422 and 485 networks.
1.5.3 UART port (JP3)
Number
Name
Description
Level
I/O
Etc.
1
VCC
DC 5V Power
-
-
required
2
RXD
Receive Data
3.3V
IN
required
3
TXD
Transmit Data
3.3V
OUT
required
4
GND
Ground
-
-
required
5
RTS
Request To Send
3.3V
OUT
optional
6
CTS
Clear To Send
3.3V
IN
optional
Table 1-3 pin assignment of the UART port
