Manual of Board ET-TOUCH PAD 4x4 V2
www.etteam.com
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9
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1
3
2
4
5
6
7
8
9
0
SHIFT
HELP
ENTER
CLEAR
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Initial Status (Default)
= When Power-ON, LED Status Key flashes on and off regularly according to Beep sound but it does not
send out any data to Port 232. It means that Touch Pad does not send out any value through Port 232 if user does not press
any key.
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Status of pressing 1 Key
= When pressing any one Key, ET-TOUCH PAD sends out 3 Byte Data to Port232. The first Byte it sends
out is ASCII ‘P’ to notify that it is the status of pressing Key; the second Byte is ASCII Code the pressed Key; and finally,
the third Byte is 0x0D to end. For Key Code, please look at the upper right of Table Key Code in the box of ASCII or
HEX.
Table shows the format of sending Data when pressing one Key.
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Status of pressing 2 Keys simultaneously
= It presses 2 Keys simultaneously, it means that it presses Key F together with another
Key simultaneously (Key F + any Key).
1) When pressing Key F, the first Byte that ET-TOUCH PAD sends out is ASCII ‘P’ (0x50); the second Byte
is Key Code ASCII ‘F’ (0x46); and finally, the last Byte is 0x0D to end.
2) The second Key that is pressed can be whatever Key as preferred. User has to press the second Key while
Key F is still pressed. The first Byte that ET-TOUCH PAD sends out is ASCII ‘F‛(0x46); the second Byte
is ASCII Key Code of the pressed Key; and finally, the last Byte is 0x0D to end.
Table shows the format of sending Data when pressing 2 Keys together.
NOTE:
When pressing 2 Keys together, there are 2 sets of Data that are sent out. The first set is Byte Data of Key F that is ASCII
‘P’
, it is sent out to notify that it is status of pressing Key and its format is the same as pressing 1 Key as mentioned above. The second set is
Byte Data of any Key that is pressed together with Key F; in this case, the first B
yte that is sent out is ASCII ‘F’ to tel
l the status of pressing
Key together with Key F and follow by Key Code of any Key that is pressed together with Key F.
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Status of releasing 1 Key
= When released any Key that is pressed, ET-TOUCH PAD sends 3 Byte Data to Connector 232. The first
Byte it sends out is ASCII ‘R’ to notify the status of releasing 1 Key; the second Byte is ASCII Code of the released Key;
and the last Byte is 0x0D to end.
Table shows the format of sending Data when releasing 1-Key and 2-Key.
Status Key
PRESS KEY
ASCII CODE
(Byte 1)
(Byte 2)
Key Code
‘P’ (0x50)
‘0-9’, ‘A-F’
End Byte
(Byte 3)
0x0D
Hex
Status Key
1.PRESS Key F
ASCII CODE
(Byte 1)
(Byte 2)
Key Code
‘P’ (0x50)
‘F’ (0x46)
‘F’
‘0-9’, ‘A-D’
0x0D
0x0D
End Byte
(Byte 3)
2.PRESS Key Other
Hex
Status Key
RELEASE KEY
ASCII CODE
(Byte 1)
(Byte 2)
Key Code
‘R’ (0x52)
‘0-9’, ‘A-F’
End Byte
(Byte 3)
0x0D
Hex
Ex. Key 7
R7
0x0D
Ex. Key F+Key2
PF
0x0D
F2
0x0D (
)
Ex. Key 5
P5
0x0D
