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VT-SBC-C3558R | User Manual 16
2.4.7
J71 RS232 & RS485 (7)
VT-SBC-C3558R offers an RS232 & RS485 connector which is connected to the host PC via
a USB to serial converter. RS232 corresponds to node /ttyS0 and RS485 to node /ttyS1 in
the software environment.
Specification: 1 x 5, 3.81mm, 8A, No Lock, M, RA, -40~105
℃
, THR, RoHS
Pinout description:
Pin
Name
Type
Description
1
RS485A
IO
RS485A
2
RS485B
IO
RS485B
3
TXD1_R
O
RS232 TXD
4
RXD1_R
I
RS232 RXD
5
GND
P
Ground
2.4.8
JP1 RS485 termination resistor (8)
There is a 120
Ω
RS485 termination resistor on the Board to prevent reflection at the ends
of the network for improved signal quality.
Specification: 1 x 2, 2.0mm, 1A, 8.2mmH, M, Vert, WDT, THR, RoHS
Normal mode (default)
Termination mode between RS485 A & B (pins 1 and 2 shorted)
Pin 1