© Sealevel Systems, Inc.
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ACB-ULTRA.LPCI User Manual
I/O Signal Derivation
The ACB-ULTRA.LPCI
input/output signals are directly generated via the Zilog
16C32 IUSC. The following table defines these signals, their origin pin and signal
name following the conventions set by the 16C32 user’s manual. If using a Sealevel
Systems, Inc. supplied driver, this is for informational use only.
Signal
Source
Transmit Data
16C32 TXD Pin
Request To Send
16C32 Port7 Pin
Data Terminal Ready
16C32 Port6 Pin
Transmit Signal Element Timing
16C32 TXC Pin
Receive Data
16C32 RXC Pin
Clear To Send
16C32 CTS Pin
Data Set Ready
16C32 RXREQ Pin
Data Carrier Detect
16C32 DCD Pin
Transmit Clock
16C32 TXCO Pin
Receive Clock
16C32 RXCO Pin
Ring Indicator
16C32 TXREQ Pin
25 Pin Connector Signal Layouts (DB-25 Male)
In all modes, Pin 1 has a 1K ohm resistor to GND and pin 25 has a 1K ohm resistor
to +5V connection. This is useful for RS-485 biasing. If this presents a problem in
your implementation, please contact Sealevel Systems’ Technical Support for aid in
removing.
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