RS-232
Connections
Manual Documentation Number: PES1A/PESV1A-2907m
45
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 –
www.bb-elec.com
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 –
www.bb-europe.com
A
A
p
p
p
p
e
e
n
n
d
d
i
i
x
x
D
D
:
:
R
R
S
S
-
-
2
2
3
3
2
2
C
C
o
o
n
n
n
n
e
e
c
c
t
t
i
i
o
o
n
n
s
s
DB-9M
Pin
Signal RS-232
DTE
1 Carrier
Detect
DCD
In
2
Receive Data
RXD
In
3
Transmit Data
TXD
Out
4
Data Terminal Ready
DTR
Out
5
Signal Ground
GND
---
6
Data Set Ready
DSR
In
7
Request To Send
RTS
Out
8
Clear To Send
CTS
In
9 Not
Connected NA
NA
Figure 21. RS-232 Connections in a DB-9 Connector
