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3.3
Parallel Port
This port is usually connected to a printer. The ROCKY-3702EV
includes an on-board parallel port accessed through a 26-pin
flat-cable connector CN4.
• CN4 : Parallel Port Connector
PIN NO.
DESCRIPTION
1
STROBE#
3
DATA 1
5
DATA 3
7
DATA 5
9
DATA 7
11
BUSY
13
PRINTER SELECT
15
ERROR#
17
PRINTER SELECT LN#
19
GND
21
GND
23
GND
25
GND
3.4
Serial Ports
The ROCKY-3702EV offers two high speed NS16C550
compatible UARTs with Read/Receive 16 byte FIFO serial ports
(COMA/COMB).
• CN12 : Serial Port 9-pin D-sub Connector (COMA)
PIN NO.
DESCRIPTION
1
DATA CARRIER DETECT
2
RECEIVE DATA
3
TRANSMIT DATA
4
DATA TERMINAL READY
5
GROUND
6
DATA SET READY
7
REQUEST TO SEND
8
CLEAR TO SEND
9
RING INDICATOR
PIN NO.
DESCRIPTION
2
DATA 0
4
DATA 2
6
DATA 4
8
DATA 6
10
ACKNOWLEDGE
12
PAPER EMPTY
14
AUTO FORM FEED #
16
INITIALIZE
18
GND
20
GND
22
GND
24
GND
26
N/C
(DCD)
(RXD)
(TXD)
(DTR)
(GND)
(DSR)
(RTS)
(CTS)
(RI)
15
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