CHAPTER 2: INSTALLATIONS 01 SEPTEMBER 1998 PAGE 10
HE500OCS050/051 User Manual
2.1.4
RS-232 Port
Table 2.3 – RS-232 Port Pins
Pin
Signal
Description
Direction
1
DCD
Always high
Out
2
TXD
Transmitted Data
Out
3
RXD
Received Data
In
4
DTR
Ignored
-
5
GND
Ground
-
6
DSR
Always high
Out
7
CTS
Clear to Send
In
8
RTS
Request to Send
Out
9
RI
Always high
Out
Figure 2.6 – CAN Port Wiring Diagram
1 20
Ω
V-
CN
_L
SH
IE
L
D
CN
_H
V+
V-
CN
_L
SH
IE
L
D
CN
_H
V+
V-
CN
_L
SH
IE
L
D
CN
_H
V+
120
Ω
V-
CN
_L
SH
IE
L
D
CN
_H
V+
R E D
W H T
S H IE LD
B L U
B L K
RE
D
12
0
Ω
SH
IE
L
D
R E D
W H T
B L U
B L K
V+
CN
_
L
V-
SH
IE
L
D
12
0
Ω
CN_H
V+
CN
_
L
V-
SH
IE
L
D
CN_H
RE
D
WH
T
BL
U
BL
K
120
Ω
V+
CN
_
L
V-
SH
IE
L
D
CN_H
RE
D
WH
T
BL
U
BL
K
R E D
W H T
S H IE LD
B L U
B L K
R E D
W H T
B L U
B L K
V+
CN
_
L
V-
SH
IE
L
D
CN_H