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© Sealevel Systems, Inc. 7406 Manual | SL9066 7/2021
Technical Description
The VERSA COMM+4.LPCI
utilizes the 16C854 UART. This chip features programmable baud rate, data
format, interrupt control and a 128-byte input and output FIFO and is functionally 4 16C850 UARTs.
Connector Pin Assignments
DB-25 Female (RS-232 DTE)
Signal
Name
Pin #
Mode
GND
Ground
7
TD
Transmit Data
2
Output
RTS
Request To Send
4
Output
DTR
Data Terminal Ready
20
Output
RD
Receive Data
3
Input
CTS
Clear To Send
5
Input
DSR
Data Set Ready
6
Input
DCD
Data Carrier Detect
8
Input
RI
Ring Indicator
22
Input
DB-9 Male (EIA-574 DTE)
Signal
Name
Pin #
Mode
GND
Ground
5
TD
Transmit Data
3
Output
RTS
Request To Send
7
Output
DTR
Data Terminal Ready
4
Output
RD
Receive Data
2
Input
CTS
Clear To Send
8
Input
DSR
Data Set Ready
6
Input
DCD
Data Carrier Detect
1
Input
RI
Ring Indicator
9
Input
