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April 2, 2004 • Alcorn McBride MP3 Audio Machine User’s Manual • Rev H • Page 11
Parallel Port: Control Connector
Be sure to configure the
MP3 Audio Machine for
contact closures or
voltage inputs before
connecting any wires.
This connector provides all of the signals needed to interface to the MP3 Audio
Machine. In addition to serial control, the first fifteen files of the MP3 Audio
Machine may be played, paused or stopped using eight parallel inputs located on the
rear connector. These inputs may be either contact closures such as momentary
buttons, or voltage inputs from a controller such as a PLC. The DIP switch located
on the side of the unit next to the connector selects between the two input types.
More information on these inputs may be found in the section entitled Parallel
Control.
The pinout of the Control Connector is shown below:
Pin Function Pin Function
1 Mute 20 Ground
2 Pause 21 Ground
3 Stop 22 Ground
4 Loop 23 Ground
5 File Select 1 24 Ground
6 File Select 2 25 Ground
7 File Select 4 26 Ground
8 File Select 8 27 Ground
9 Playing Output (contact 1) 28 Playing Output (contact 2)
10 Fault Output (contact 1) 29 Fault Output (contact 2)
11 Mute (voltage input) 30 5 VDC output, 100 ma max.
12 Pause (voltage input) 31 Ground
13 Stop (voltage input) 32 n. c.
14 Loop (voltage input) 33 Ground
15 File Select 1 (voltage input) 34 n.c.
16 File Select 2 (voltage input) 35 Ground
17 File Select 4 (voltage input) 36 RS-232 TXD (from MP3
Audio Machine)
18 File Select 8 (voltage input) 37 RS-232 RXD (to MP3 Audio
Machine)
19 Ground