Kenton GPMX-16 User manual

GPMX
GPMXGPMX
GPMX-
--
-16
1616
16
16 MIDI to GPOs and 16 GPIs to MIDI
Operating manual

2
INTRODUCTION
Welcome to the GPMX-16 - GPI to MIDI unit. The GPMX-16 is very easy to use, but please take a few
moments to rea through the manual to avoi any operational ifficulties.
CONNECTIONS
DC IN 9V
Plug the power a apter into here. The unit will take an a apter with an output of 9V either regulate or
unregulate . The socket is a 2.1mm type with centre positive an is compatible with locking type plugs.
Do not use a power supply with an output voltage higher than 9V, an the GPMX-16 must not share an
a aptor with any other evice. Failure to observe this will invali ate your warranty, an will probably
amage the other evice, the GPMX-16 an /or the power supp
ly.
MIDI In
This input allows you to control the GPO outputs using MIDI. It also allows you to ‘ aisy chain’ several
boxes together. Any ata receive at the MIDI In socket is merge with any new ata generate from
the GPI inputs an everything is then sent to the MIDI outs 1 & 2. There is no limit to the number of
GPMX-16 units that can be aisy chaine together as the ata is re-generate rather than being
merely copie .
MIDI out 1 & MIDI out 2
MIDI out 1 an MIDI out 2 carry i entical MIDI information. The secon output is provi e so that ata
can be set to a backup computer system at the same time as supplying the primary computer.
DISPLAY
The isplay has several functions; In normal operating mo e, the isplay will show three horizontal
bars until a GPI input is receive , it will then show a number between 1 an 16 to in icate the GPI input
which was activate . Note that if two inputs are receive in quick succession, it will show the later one.
After a couple of secon s, the isplay will revert to the three ashes isplay. In this mo e, the ots
above the isplay will in icate MIDI In an MIDI out activity.
The isplay is also use for e iting, which will be ealt with later.
USING THE GPMX-16
GP Inputs are on pins numbere 1 to 8 of the 9 pin D socket connectors (the lower ones) – pin 9 is the
common groun connection.
GP Outputs are on pins numbere 1 to 8 of the 9 pin D plug connectors (the upper ones) – pin 9 is the
common connection.
When power is applie to the GPMX-16, the wor s KENTON GPMX will scroll across the isplay,
then three horizontal bars will show, in icating that no GPI input has recently been receive .
Various parameters can be e ite an store – see the section on e iting for more information.
The GPMX-16 also contains a MIDI analyser – see the MIDI analyser section for more information.
EDIT MODE
To put the GPMX-16 into e it mo e, use a screw river or pen to press the recesse e it button. The
edit ot will light to show that it is in e it mo e. The para ot will also light to show that the require
parameter can be change by using the inc & ec buttons. When the require parameter has been
selecte , press the mo e button. The para ot will go out an the va ot will light to in icate that the
value can now be change by using the inc an ec buttons.

3
When the require value has been set, either press the mo e button again to select another
parameter, or press the e it button again. This will return you to normal operating mo e again.
Whenever you return to Parameter mo e the settings you have change will be save . Settings are
store in non-volatile EEPROM memory.
Note also that the GPMX-16 will continue to function normally uring the e it process, except that the
isplay will not in icate an activate input. The parameter names below also scroll across the isplay.
Edit parameters:
P10 ‘GP In Midi transmit channe ’ - select the MIDI transmit channel for all GP Inputs
available values – 1 to 16 – efault =1
P11 ‘GP In message type’ - set the output MIDI message type for all GP Inputs
available values – ‘not’ (notes) , ‘con’ (controllers) or ‘prg (program changes) – efault =notes
P12 ‘GP In 1 note number’ - set the note (or cont or prog) number for GP Input number 1 (2 to
8 follow consecutively) - available values 0 to 120 – efault =36
P13 ‘GP In 1-8 off send’ - set whether MIDI off messages are sent for GP Inputs 1 to 8
available values – yes or no – efault =yes (note: program changes o not sen off messages)
P14 ‘GP In 9 note number’ - set the note (or cont or prog) number for GP Input number 9 (10
to 16 follow consecutively) - available values 0 to 120 – efault =44
P15 ‘GP In 9-16 off send’ - set whether MIDI off messages are sent for GP Inputs 9 to 16
available values – yes or no – efault =yes (note: program changes o not sen off messages)
P16 ‘GP In debounce time’ - sets the ebounce value for all GP Inputs
available values – 1 to 995 in 5mS steps – efault =20 (value shown in millisecon s approx)
P17 ‘GP In On ve ’ - set the On velocity value use for all GP Inputs when MIDI notes are being
sent - available values – 1 to 127– efault =127
P20 ‘GP Out Midi rec channe ’ - select the MIDI receive channel for all GP Outputs
available values – 1 to 16 – efault =2
P21 ‘GP Out message type’ - set the output MIDI message type for all GP Outputs
available values – ‘not’ (notes) , ‘con’ (controllers) or ‘prg (program changes) – efault =notes
P22 ‘GP Out 1 note number’ -
set the note (or cont or prog) number for GP Output number 1
(2 to 8 follow consecutively) - available values 0 to 120 – efault =36
P23 ‘GP Out 1-8 pu se ength’ - set pulse length for GP Outputs 1 to 8 – available values
oFF & 1 to 250 – efault =100 (values in millisecon s approx - see full escription on next page)
P24 ‘GP Out 9 note number’ - set the note (or cont or prog) number for GP Output number 9
(10 to 16 follow consecutively) - available values 0 to 120 – efault =44
P25 ‘GP Out 9-16 pu se ength’ - set pulse length for GP Outputs 9 to 16 – available values
oFF & 1 to 250 – efault =100 (values in millisecon s approx - see full escription on next page)
P26 ‘GP Out CC data thresho d’ - set the ata value at which GP outputs turn on when the
MIDI source is CCs – available values 1 to 127 – efault 64
P30 ‘soft thru’ - set whether messages receive at the MIDI Input are echoe to the MIDI outs
-available values – on or off – efault on

4
PULSE LENGTHS
When the pulse length parameters show a ata value from 1 to 250 then only a MIDI ON message is
require as the output will turn itself off again after the specifie time. If they show ‘oFF’ then the
outputs will remain on until an OFF message is receive . The time shown is approximate in
millisecon s.
INPUT & OUTPUT CONNECTIONS
Connections for the GP Inputs are on the lower pair of 9 pin D connectors. Below is the view looking at
the back of the unit an is the same view as looking at the sol er connections of the correspon ing
plug.
Pins 1 – 8 are the input pins an pin 9 is the common groun connection. The input pins are internally
pulle up by 4K7 ohm pullups to +3.3 volts. Shorting an input to groun (pin 9) activates that input.
Connections for the GP Outputs are on the upper pair of 9 pin D connectors. Below is the view looking
at the back of the unit an is the same view as looking at the sol er connections of the correspon ing
socket.
Pins 1 – 8 are the output pins an pin 9 is the common connection. Pin 9 can be + or – relative to pins
1 to 8. The GPOs can switch up to 50 Volts at 100mA of resistive loa . If you are switching in uctive
loa s (such as conventional relays) ensure you use a snubber circuit or you will amage the soli state
relays insi e the GPMX-16.
MIDI ana yser mode:
The GPMX-16 has a built-in MIDI analyser function. This feature allows you to see what types of MIDI
messages are being transmitte by your master keyboar /sequencer making the GPMX-16 a useful
iagnostic tool.
To enter analyser mo e, you must power on the GPMX-16 whilst hol ing the SELECT button. The
isplay will then show ‘rC’ for receive channel & status mo e. This means the isplay will show the
MIDI receive channel of any messages it receives in the right han two igits, an will show status in
the left igit – this is explaine further own the page.
Using the INC, DEC, an SELECT buttons, ifferent types of MIDI messages receive may be
isplaye :
SELECT Short press [rC] Receive channel & status
Long press [PC] Program change
DEC Short press [nt] Note number
Long press [nv] Velocity
INC Short press [Cn] Controller number
Long press [Cv] Controller value
For whichever of the above selecte , the GPMX-16 will isplay the value it receives for the type of
message currently selecte .

5
Although pitchben an after-touch are not strictly controllers, when Controller number [Cn] mo e is
selecte , ‘pb’ will be isplaye if a pitchben message is receive , an ‘af’ will be isplaye if an after-
touch message is receive .
If Controller value [Cv] mo e is selecte , an pitchben or after-touch messages are receive , their
values will be isplaye .
When Receive channel & status [rC] mo e is selecte , the right han 2 igits show the receive MIDI
channel (if applicable) an the left han igit operates as a receive MIDI message in icator. LED
segments will flash when then following types of messages are receive : Note on, Note off, Sysex,
Timing clock (MIDI clock), Start, Stop, Continue.
The top left ot (any MIDI message) operates in all mo es, not just for Receive Channel & Status
mo e.
To exit MIDI analyser mo e, the power switch of the GPMX-16 must be turne off then on again.
Any MIDI
message Clock start
Clock
continue
Note off
MIDI clock
Clock stop
Sysex
Note on

6
FACTORY DEFAULTS
If you wish to reset your GPMX-16 to factory efaults, you can o so by turning the power on whilst
hol ing own all three push buttons (mo e, ec & inc). This will return the GPMX-16 to it’s efault
settings.
‘F ’ (factory efaults) will momentarily be isplaye when this has been one.
DISPLAYING THE FIRMWARE ERSION NUMBER
Power the unit on while hol ing the ‘INC’ button presse . While the INC button is hel , the firmware
revision number [1xxx] will be isplaye in pairs – two ashes then igits 1 & 2 then igits 3 & 4
repeate . Releasing the INC button will revert to the normal operational mo e.
SPECIFICATIONS
Power Input 9V DC – switch mo e mains a aptor supplie
Power consumption 200mA max, 2.1mm plug (centre positive)
MIDI In, Out1 & Out2 (out1 & out2 give the same ata out)
Inputs 16 GPI – 8 on each of 2 x 9 pin D connectors – pin 9 common groun
Outputs 16 GPO – 8 on each of 2 x 9 pin D connectors – pin 9 common
Display 3 x 7 segment isplay
Weight 1Kg inclu ing PSU
Dimensions 190 x 110 x 45 mm
Non-volatile memory EEPROM (no back-up battery require )
WARRANTY
The GPMX-16 comes with a 12 month (from purchase ate) back to base warranty, (i.e. customer
must arrange an pay for carriage to an from Kenton Electronics).
Brookfarm House, 1 Station Road, South Wimbledon, London, SW19 2LP, UK
Tel: [phone] Fax: [phone]
[e-mail] www.kenton.co.uk
firmware rev# 1001 e. & o. e.  30
th
April 2014