Technical Description
Sealevel Systems
ACB-MP.PCI
Page
4
Interface Selection
The
ACB-MP.PCI
supports a variety of electrical interfaces. Refer to the
Control and Status Register Definitions
found in the
Technical Description
section of this manual for this bit description. There is line termination on
RXD, RXC, and TXC in the following modes: RS-530, RS-530A, RS-485T, and V.35.
HEX
M3
M2
M1
M0
Interface Mode
0
0
0
0
0
All signals are high impedance
1
0
0
0
1
* not supported *
2
0
0
1
0
RS-232
3
0
0
1
1
* not supported *
4
0
1
0
0
RS-485T with 120 ohm termination
5
0
1
0
1
RS-485 without termination
6,7,8,9
0
1
1
0
* not supported *
A
1
0
1
0
single ended loop-back
B
1
0
1
1
differential loop-back
C
1
1
0
0
* not supported *
D
1
1
0
1
RS-530
E
1
1
1
0
V.35
F
1
1
1
1
RS-530A
25 Pin Connector Signal Layouts (DB-25 Male)
RS-232 Signals
Base+5, M3-M0=2, 0010
Signal
Name
Pin #
Mode
GND
Ground
7
RD
Receive Data
3
Input
CTS
Clear To Send
5
Input
DSR
Data Set Ready
6
Input
DCD
Data Carrier Detect
8
Input
TM
Test Mode
25
Input
TXC
Transmit Clock
15
Input
RXC
Receive Clock
17
Input
TSET
Transmit Signal Element Timing
24
Output
DTR
Data Terminal Ready
20
Output
TD
Transmit Data
2
Output
RTS
Request To Send
4
Output
LL
Local Loop-back
18
Output
RL
Remote Loop-back
21
Output
Technical Note
: Please terminate any control signals that are not going to be used. The most common way to do
this is connect RTS to CTS and RI. Also, connect DCD to DTR and DSR. Terminating these pins, if not used, will
help insure you get the best performance from your adapter.
