C
HAPTER
1
I
NTRODUCTION
ALR-9900
H
ARDWARE
S
ETUP
G
UIDE
DOC.
CONTROL
#8102086-000
REV
A
7
RS-232 Port Pinouts
RS-232 Connector (Female DB-9F)
Pin 1
DCD Connected to Pin 6
Pin 2
TR1 Transmit Data (Output)
Pin 3
RC1 Receive Data (Input)
Pin 4
DTR Connected to Pin 6
Pin 5
Ground
Pin 6
DSR Connected to Pin 4
Pin 7
RTS Connected to Pin 8
Pin 8
CTS Connected to Pin 7
Pin 9
Not Connected
RS-232
C
ONNECTOR
(F
EMALE
)
–
L
OOKING AT
R
EADER
System Architecture
Antenna
Switch
RF
Modulator
RF
Receiver
RF Source
Digital
Control
Circuitry
Host
Communication
Interface
A0
A1
A2
A3
Figure 3 - System Architecture for the ALR-9900 Reader
5
4
3
2
1
9
8
7
6
