User Guide

Pin Assignments
B-2 FIC A440 Series Service Manual
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2 Serial Port Connector
Serial Port ConnectorSerial Port Connector
Serial Port Connector
The pin assignment of the serial (COM1) port connector is as follows:
No PIN ASSIGMENT (by: sort) DESCRIPTION
1 DCDA#_T:I Active low Data Carrier Detect inputs
For the serial port.
2 SINA_T:I Receiver serial data input for port 1.
3 SOUTA_12:O Transmit serial data output for port 1.
4 DTRA#_6:O Active low Data Terminal Ready
Outputs for the serial port.
5 GND Ground
6 DSRA#_T:I Active low Data Set Ready inputs
For the serial port.
7 RTSA#_6:O Active low Request to Send Outputs
For the serial port.
8 CTSA#_T:I Active low Clear to Send inputs
For the serial port.
9 RI#_T:I Active low Ring Indicator inputs
For the serial port.
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3 Parallel Port Connector
Parallel Port ConnectorParallel Port Connector
Parallel Port Connector
The pin assignment of the parallel/printer (LPT1) port connector is as follows:
No PIN ASSIGMENT(by: sort) DESCRIPTION
1 STB#/DS0#_D14/_P14/_D12:O An active low pulse on this output is used to strobe the
printer data into the printer. The STROBE output is the
complement of bit 0 of the printer control register. Refer
to parallel port description for use
of this pin in ECP and EPP mode. Active low outputs
select driver 0.
2 PD0/INDEX3#_P14/_S:IO/I Port data 0.
This active low Schmidt trigger input senses from the
disk drive that the head is positioned over the beginning
of a track as marked by an index hole.
3 PD1/TRK0#_P14/_S:IO/I Port data 1
This active low Schmidt trigger input senses from the
disk drive that the head is positioned over the outermost
track.
4 PD2/WRTPRT#_P14/_S:IO/I Port data 2
This active low Schmidt trigger input senses from the
disk drive that a disk is write protected. Any write
command is ignored.
5 PD3/RDATA#_P14/_S:IO/I Port data 3
Raw serial bit stream from the disk drive, low active.
Each falling edge represents a flux transition of the
encoded data.
6 PD4/DSKCHG_P14/_S:IO/I Port data 4
This input senses that the driver door is open or that the
diskette has possibly been changed since the last drive
selection.
7 PD5_P14:IO Port data 5