Appendix B
I/O Interface Board Description
CoreModule 740
Reference Manual
39
Note:
The shaded areas denote power or ground.
lists the signals and their descriptions for the Auxiliary Battery interface which provides a right-
angle, single row, 4-pin header. The third column in this table denotes the corresponding pins from the on-
board J2 header.
Note:
The shaded areas denote power or ground.
21
BSY
J5-42
Parallel Busy – This is a Status output signal from the printer. A High
State indicates the printer is not ready to accept data.
22
GND
J5-44
Ground
23
PE
J5-46
Parallel Paper End – This is a Status output signal from the printer. A
High State indicates it is out of paper.
24
GND
J5-48
Ground
25
Slct
J5-50
Parallel Select – This is a Status output signal from the printer. A High
State indicates it is powered on.
26
IR FIRM
J5-52
IR Function Mode Select – Disabled (Terminated with 10k ohm
resistor to ground on CoreModule 740.)
27
NC
J5-54
Not connected
28
GND
J5-56
Signal Ground
29
IR TXD
J5-58
IR Transmit Data (HPSIR or ASKIR)
30
IR RXD
J5-60
IR Receive Data (HPSIR or ASKIR)
31
SPKR+
J5-62
S drive signal
32
GND
J5-64
Speaker return
33
RST SW
J5-66
Reset Switch
34
KB SW
J5-68
Not Connected (Keyboard switch)
35
KB DTA
J5-70
Keyboard Data signal
36
KB CLK
J5-72
Keyboard Clock signal
37
GND
J5-74
Digital Ground
38
KB PWR
J5-76
Keyboard power (+5V +/-5%)
39
BATV+
J5-78
External Backup B
40
BATV-
J5-80
External Backup Battery Return -
Table B-3. Auxiliary Battery Interface Pin Signals (J10)
Pin # Signal
From On-Board
Connector & Pin #
Description
1
BATV+
J2-39
External Backup B
2
KEY
NA
Key – Not connected
3
NC
NA
Not connected
4
BATV-
J2-40
External Backup Battery Return -
Table B-2. Utility 2 Interface Pin Signals (J2) (Continued)
