Manual
© Sealevel Systems, Inc. 
- 7 - 
ACB-MP.PCI User Manual 
RS-485 or RS-485T 
Base+5, M3-M0=4, 0100 (With termination) 
Base+5, M3-M0=5, 0101 (Without termination) 
Pin #  Signal  Name  Mode 
2  TDA TX–  Transmit Negative  Output 
3  RDA RX–  Receive Negative  Input 
7 GND  Ground   
9  RXCB RXC+  Receive Clock Positive  Input 
11  TSETB TSET+  Transmit Signal Element Timing +  Output 
12  TXCB TXC+  Transmit Clock Positive  Input 
14  TDB TX+  Transmit Positive  Output 
15  TXCA TXC–  Transmit Clock Negative  Input 
16  RDB RX+  Receive Positive  Input 
17  RXCA RXC–  Receive Clock Negative  Input 
18 LL  Local Loopback  Output 
21 RL  Remote Loopback  Output 
24  TSETA TSET–  Transmit Signal Element Timing –  Output 
RS-530 (RS-422) 
Base+5, M3-M0=D, 1101 
Pin #  Signal  Name  Mode 
2  TDA TX–  Transmit Negative  Output 
3  RDA RX–  Receive Negative  Input 
4  RTSA RTS–  Request To Send Negative  Output 
5  CTSA CTS–  Clear To Send Negative  Input 
6  DSRA DSR–  Data Set Ready Negative  Input 
7 GND  Ground   
8  DCDA DCD–  Data Carrier Detect Negative  Input 
9  RXCB RXC+  Receive Clock Positive  Input 
10  DCDB DCD+  Data Carrier Detect Positive  Input 
11  TSETB TSET+  Transmit Signal Element Timing +  Output 
12  TXCB TXC+  Transmit Clock Positive  Input 
13  CTSB CTS+  Clear To Send Positive  Input 
14  TDB TX+  Transmit Positive  Output 
15  TXCA TXC–  Transmit Clock Negative  Input 
16  RDB RX+  Receive Positive  Input 
17  RXCA RXC–  Receive Clock Negative  Input 
18 LL  Local Loopback  Output 
19  RTSB RTS+  Request To Send Positive  Output 
20  DTRA DTR–  Data Terminal Ready Negative  Output 
21 RL  Remote Loopback  Output 
22  DSRB DSR+  Data Set Ready Positive  Input 
23  DTRB DTR+  Data Terminal Ready Positive  Output 
24  TSETA TSET–  Transmit Signal Element Timing –  Output 










