© Sealevel Systems, Inc.
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ACB-ULTRA.LPCI 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
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
20
DTRA DTR–
Data Terminal Ready Negative
Output
21
RL
Remote Loopback
Output
23
DTRB DTR+
Data Terminal Ready Positive
Output
24
TSETA TSET–
Transmit Signal Element Timing –
Output
Note:
The RX+/- lines do not have pull up or pull down biasing. For high baud rates or long
distances, add 1K Ω resistor from RX
-
to GND, and add 820 Ω resistor from RX+ to +5V
DTR (depending on state of DTR in application – do not toggle DTR).
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