Beckmann Egle MT 20x2 Manuel - Page 12

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MT 20x2/40x2

Operation

The terminal is controlled by command sequences delivered via a serial interface or by
calling up pre-programmed fixed texts by contact arrangement.
Data Transfer
Data transfer takes place via the MiniTerminal's RS232 interface.
Standard setting: 9600 Baud / 8 Data bits / No Parity / 2 Stop bits
If 2 Stop bits cannot be applied on the transmitter, 1 Stop bit should ensure full
functionality.
Setting options: 1200, 2400, 4800, 9600 Baud (see Commands)
The serial interface cannot send and receive simultaneously. The MiniTerminal's
RTS signal (or CTS signal on the PC) should be checked when using the keyboard.
Addressing
It's possible to link up to 16 MiniTerminals with a serial interface. In this case the TX
and CTS should NOT be connected (and fixed texts must be programmed before the
devices are connected, see Commands "ESC R").
To enable communication with individual terminals, addresses are assigned on CN4,
pins 1-4. The MiniTerminal recognises all addresses as standard and so no encoding
is necessary for CN4, pins 1-4.
CN4
Pin 1
Pin 2
Pin 3
Pin 4
J9
Keyboard
The maximum dimension of the matrix keyboard is 8 columns and 4 lines (32 keys). It
is connected to connector CN3. On pressing a key, the MiniTerminal sends the
keycode to the PC or processor. Because it is not possible to send and receive
simultaneously, the CTS line should be set before the keycode is sent to avoid
collisions.
A short-circuit may occur on the keyboard's µP outport if several keys are pressed at
once. This may lead to malfunctions of the µP. For this reason, a barrier diode
should be added to every key column input (see ill.).
PinNo
CN3
9
11
13
15
Copyright BECKMANN+EGLE GmbH, all rights reserved.
Function
Addr0
Addr1
Addr2
Addr3
close = Bus Mode
open = Auto Fixed Text
Column
0
1
2
PinNo CN3
2
4
6
Line
0
1
2
3
binary encoded,
open connector is
High / 1
Standard
3
4
5
6
7
8
10
12
14
16
Key
1 - 8
9 - 16
17 – 24
25 – 32
Page 12
if Key 19 is pressed, the
MiniTerminal sends the keycode
22h
00h – 07h
10h – 17h
20h – 27h
30h – 37h
Internet: www.bue.de