Manual

© Sealevel Systems, Inc.
- 6 -
ACB-MP.PCI User Manual
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 120Ω 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 loopback
B 1 0 1 1
differential loopback
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
DB-25M Connector Pin Outs
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
24 TSET Transmit Signal Element Timing Output
25 TM Test Mode Input