© Sealevel Systems, Inc.
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ACB-ULTRA.LPCI User Manual
RS-232 Signals
Base+5, M3-M0=2, 0010
Pin #
Signal
Name
Mode
2
TD
Transmit Data
Output
3
RD
Receive Data
Input
4
RTS
Request To Send
Output
5
CTS
Clear To Send
Input
6
DSR
Data Set Ready
Input
7
GND
Ground
8
DCD
Data Carrier Detect *
Input
15
TXC
Transmit Clock
Input
17
RXC
Receive Clock
Input
18
LL
Local Loopback
Output
20
DTR
Data Terminal Ready
Output
21
RL
Remote Loopback
Output
22
RI
Ring Indicator
Input
24
TSET
Transmit Signal Element Timing
Output
25
TM
Test Mode
Input
*When in External Sync mode, the external sync signal is fed into DCD.
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