1.2.2.1.
Serial Interface
6
9
8
7
2
1
4
3
5
Fig 1.2 Serial Pin Assignment of EG-SR-7100A Test Board
Pin Number
Signal
Description
1 NC Not
Connected
2 RxD
Receive
Data
3 TxD
Transmit
Data
4 DTR
Data
Terminal
Ready
5 GND
Ground
6 DSR
Data
Set
Ready
7
RTS
Request To Send
8 CTS
Clear
To
Send
9 NC Not
Connected
Table 1.2 Serial Pin Description
y
RxD, TxD, GND: This is all you need if the device don’t use hardware
handshaking.
y
RxD, TxD, GND, RTS, CTS : If the device use hardware handshaking
CD 1
RD 2
TD 3
DTR 4
GND 5
DSR 6
RTS 7
CTS 8
1 CD
2 RD
3 TD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
PIN
PIN
SIGNAL
SIGNAL
Fig 1.3 Serial Cable
Hardwired Internet Connectivity Wizard (WIZnet, Inc.)
3
