User Manual
A
R
-
B1740 User'
s
Manua
l
8
Serial Port Selection
(
RS232C/422/485
)
RS-232C/422/485 Mode select (JRS2)
T
ype : JRS2: onboard 6-pin(2*3) heade
r
1
3
5
2
4
6
CPU T
yp
e Selection
T
yp
e : J1: onboard 2-
p
in heade
r
The CPU VccA
(
PLL su
pp
l
y
volta
g
e
)
could be selected b
y
J1 in 1.5 V o
r
1.8
Note: Please make sure the cor
r
ect settin
g
of CPU VccA before u
p
and runnin
g
.
JRS2 Selection 1-2 3-4 5-6
RS-232C ON OFF OFF
RS-422 OFF ON OFF
RS-485 OFF OFF ON
default setting RS-232C
Mode J1
CPU VccA : 1.8V ON
CPU VccA : 1.5V OFF
default setting VccA : 1.8 V
12