Figure 7 - RS-232 Port Configuration
HWI
HWI Pin
Pin
Name
Number
1
DCD
Data Carrier Detect (input)
2
TXD
Transmit Data (output)
3
RXD
Receive Data (input)
4
DSR
Data Set Ready (input)
5
GND
Ground
6
DTR
Data Terminal Ready (output)
7
CTS
Clear To Send (input)
8
RTS
Request To Send (output)
9
RI
Ring Indicate (input)
Figure 8 - Ethernet Port and Cable Configuration
6
Description
for
Hardware Handshaking
HWI Processor
Pin
Processor
1
Transmit +ve
2
Transmit -ve
3
Receive +ve
4
No Connection
5
No Connection
6
Receive -ve
7
No Connection
8
No Connection
Crossover Cable Configuration
A crossover cable is used when
connecting the processor directly
to a laptop or other non-hub
device (a/v systems, HVAC, etc.)
Required for
Required for Simple
(Hardware Handshaking Disabled)
X
X
X
X
X
X
X
Ethernet Hub/Switch
Receive +ve
Receive -ve
Transmit +ve
No Connection
No Connection
Transmit -ve
No Connection
No Connection
1
2
3
NC
4 NC
5 NC
NC
6
7 NC
NC
NC
8 NC
Communications
X
X
X
1
2
3
4
5
6
7
8