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Section 5: Interface Specifications
Page 5-42 GT Series Operator’s Manual
5.20 IEEE 1284 INTERFACE (CONT’D)
Pin Assignment
With Centronics standards, each signal pin placement is as follows:
However, the IEEE 1284-B type connector is compliant when connecting the IEEE1284
standard.
5.21 INTERFACE SIGNALS
With Centronics standards, the content of each signal type is as follows. However, each signal
line used with IEEE1284 standards is compliant with IEEE1284 standards.
Pin no. Signal Type Content Pin no. Signal Type Content
1 HOST CLK Input 19 SIGNAL GROUND
2 DATA 1 Input 20 SIGNAL GROUND
3 DATA 2 Input 21 SIGNAL GROUND
4 DATA 3 Input 22 SIGNAL GROUND
5 DATA 4 Input 23 SIGNAL GROUND
6 DATA 5 Input 24 SIGNAL GROUND
7 DATA 6 Input 25 SIGNAL GROUND
8 DATA 7 Input 26 SIGNAL GROUND
9 DATA 8 Input 27 SIGNAL GROUND
10 PERIPH CLK Output 28 SIGNAL GROUND
11 PERIPH ACK Output 29 SIGNAL GROUND
12 nACK REVERSE Output 30 SIGNAL GROUND
13 XFLAG Output 31 NREVERSE REQUEST Input
14 HOST ACK Input 32 nPERIPH REQUEST Output
15 33
16 LOGIC GND 34
17 CHASSIS GND 35
18 PERIPHERAL LOGIC HIGH Input 36 1284ACTIVE Input
Pin no. Signal Type Direction
Contents
1 HOST CLK Input A low active pulse is necessary in synchronized
signals for scanning Data 1 to Data 8.
2 to 9 DATA 1 to DATA 8 Input When entering 8 bit parallel Data, Data 1 is the LSB
(least significant bit) and Data 8 is the MSB (most
significant bit)
10 PERIPH CLK Output This is the LOW active pulse signal that indicates the
completion of received data scanning.
11 PERIPH ACK Output HIGH active signal which indicates that the printer
cannot receive data.
12 nACK REVERSE Output HIGH active signal which indicates that the media has
run out.
13 XFLAG Output HIGH active signal which indicates that data can be
received.
14 HOST ACK Input Signal for when using the IEEE1284 standard.
17 CHASSIS GND Connects to the Frame Ground
18 PERIPHERAL
LOGIC HIGH
Output The +5V voltage on the printer side.
19 to 30
SIGNAL GROUND Connects to the ground for each signal
31 nREVERSE
REQUEST
Input LOW active signal that requests printer initialization.
32 nPERIPH
REQUEST
Output LOW active pulse signal that indicates a printer error.
36 1284ACTIVE Input Signal for when using the IEEE1284 standard.