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Technical Description, Continued
The ISP is at Base+7 on each port (Example: Base = 280 Hex, Status Port = 287, 28F... etc.). The
COMM+232.PCI will allow any one of the available locations to be read to obtain the value in the status
register. Both status ports on the COMM+232.PCI are identical, so any one can be read.
Example: This indicates that Channel 2 has an interrupt pending.
Bit Position:
Value Read:
Bit positions D7-D2 are not biased in anyway and may report back as either a 1 or a 0. When
checking the ISP, these bits should be masked.
Connector Pin Assignments
These assignments meet EIA/TIA/ANSI-574 DTE for DB-9 type connectors.
© Sealevel Systems, Inc.
7202 Manual | SL9059 7/2021
7
6
5
4
3
2
X
X
X
X
X
X
RS-232 (DB-9 Male)
Name
TD
Transmit Data
RTS
Request To Send
DTR
Data Term Ready
GND
Ground
RD
Receive Data
DCD
Data Carrier Detect
DSR
Data Set Ready
CTS
Clear To Send
RI
Ring Indicator
1
0
1
0
Pin #
3
Output
7
Output
4
Output
5
2
1
6
8
9
Mode
Input
Input
Input
Input
Input
11
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