ITX 3000/2000 Printer User Manual
(UMITX315.PDF
)
Page 26 of 82 Date: 4/27/05
Parallel Interface Pin-out Table
Pin #
Signal Name
Signal Description
Source
1
NStrobe/HostClk
Compatibility Mode: Set active low to transfer data into the
input latch of the peripheral. Data is valid while nStrobe is low.
Nibble Mode: Set high during transfers to avoid latching data
into the peripheral.
Host
2
Data 1
DATA 1 - LSB
Host
3
Data 2
DATA 2
Host
4
Data 3
DATA 3
Host
5
Data 4
DATA 4
Host
6
Data 5
DATA 5
Host
7
Data 6
DATA 6
Host
8
Data 7
DATA 7
Host
9
Data 8
DATA 8 - MSB
Host
10
nAck/PtrClk
Compatibility Mode: Pulsed low by the peripheral to
acknowledge transfer of a data byte from the host. Nibble
Mode: Used to qualify data being sent to the host.
Printer
11 Busy/PtrBusy Compatibility
Mode:
Driven high to indicate that the
peripheral is not ready to receive data. Nibble Mode: Data bit
3 then 7, then forward channel busy status.:
Printer
12 PError/AckDataReq Compatibility
Mode: Driven high to indicate that the
peripheral has encountered an error in its paper path.
Peripherals shall set nFault low when-ever they set PError
high. Nibble Mode: Data bit 2 then 6.
Printer
13
Select/Xflag
Compatibility Mode: Set high to indicate that the peripheral is
on-line. Nibble Mode: Data bit 1 then 5.
Printer
14
nAutoFd/HostBusy
Compatibility Mode: Set low by host to put some printers into
auto-line feed mode. May also be used as a ninth data, parity,
or command/data control bit. Nibble Mode: Set low to indicate
that the host can receive peripheral-to-host data, then set high
to acknowledge receipt of that nibble.
Host
15 Not
defined
16 Logic
Gnd
17 Chassis
Gnd
18 Peripheral
Logic
High
Host
19
Signal Gnd (nStrobe)
20-27
Signal Gnd (Data 1-8)
28
Signal Gnd (PError, Select, nAck)
29
Signal Gnd (Busy, nFault)
30
Signal Gnd (nAutoFd, nSelectIn, nInit)
31 nInit/nInit
Compatibility
Mode:
Pulsed low in conjunction with IEEE
1284 Active low to reset the interface and force a return to
Compatibility Mode idle phase. Nibble Mode: Set high.
Host
32 nFault/nDataAvail
Compatibility
Mode:
Set
low by the peripheral to indicate that
an error has occurred. The meaning of this signal varies from
peripheral to peripheral. Nibble Mode: Set low to indicate that
the peripheral has the data ready to send to the host.
Printer
33 Not
Defined
34 Not
Defined
35 Not
Defined
36
nSelectIn/IEEE 1284 active
Compatibility Mode: Set low by host to select peripheral.
Nibble Mode: Set high to indicate that the bus direction is
peripheral to host. Set low to terminate IEEE 1284 mode and
to set bus direction to host to peripheral.
Host
Shell
Frame
Chassis ground- data cable shield connection.
