SeaLevel ACB-ULTRA.LPCIe User Manual page 9

The RX+/- lines do not have pull up or pull down biasing. For high baud rates or long distances,
you may need to implement bias for the RX+/- lines. To do this, add connections of the RX+ pin to
pin 25, and the RX- pin to pin 1. Alternatively, add a 1K Ω resistor from the RX- pin to the GND pin,
and a 820 Ω resistor from the RX+ pin to the +5V pin of DTR. Do not toggle DTR or the bias will be
lost.
RS-530 (RS-422)
When in External Sync mode, the external sync signal is fed into DCD.
© Sealevel Systems, Inc. 5104e & 5104es Manual | SL9273 8/2021
Pin # Signal
2 TDA TX–
3 RDA RX–
4 RTSA RTS–
5 CTSA CTS–
6 DSRA DSR–
7 GND
8 DCDA DCD–
9 RXCB RXC+
10 DCDB DCD+
11 TSETB TSET+
12 TXCB TXC+
13 CTSB CTS+
14 TDB TX+
15 TXCA TXC–
16 RDB RX+
17 RXCA RXC–
19 RTSB RTS+
20 DTRA DTR–
22 DSRB DSR+
23 DTRB DTR+
24 TSETA TSET–
Name
Transmit Negative
Receive Negative
Request To Send Negative
Clear To Send Negative
Data Set Ready Negative
Ground
Data Carrier Detect Negative *
Receive Clock Positive
Data Carrier Detect Positive *
Transmit Signal Element Timing +
Transmit Clock Positive
Clear To Send Positive
Transmit Positive
Transmit Clock Negative
Receive Positive
Receive Clock Negative
Request To Send Positive
Data Terminal Ready Negative
Data Set Ready Positive
Data Terminal Ready Positive
Transmit Signal Element Timing –
Mode
Output
Input
Output
Input
Input
Input
Input
Input
Output
Input
Input
Output
Input
Input
Input
Output
Output
Input
Output
Output
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