Impulse 5104 - Manual (Page 10)

© Sealevel Systems, Inc. - 8 - 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.
RS-232 Signals
Base+5, M3-M0=2, 0010
Signal Name Pin # Mode
GND Ground 7
RD Receive Data 3 Input
CTS Clear To Send 5 Input
DSR Data Set Ready 6 Input
DCD Data Carrier Detect 8 Input
TM Test Mode 25 Input
RI Ring Indicator 22 Input
TXC Transmit Clock 15 Input
RXC Receive Clock 17 Input
TSET Transmit Signal Element Timing 24 Output
DTR Data Terminal Ready 20 Output
TD Transmit Data 2 Output
RTS Request To Send 4 Output
LL Local Loop-back 18 Output
RL Remote Loop-back 21 Output