MERak
MMk-656
Compact Emergency Telephone for Lifts
Rev. M1.5 – S2.5
©
MERak. All rights reserved
Instruction and Connection Manual
18 of 20
Image 4: Connector J3
The number of data bits is modifiable between 8N1 and 9N1 (see programming manual II (PC),
command
*A83y#
©
).
The speed of the channel is modifiable using a command in PC mode (see programming manual
II (PC), command
*A86y#
©
).
Value
0
1
2
3
4
5
Speed (bps) 1200 2400 4800 9600 19200 38400
The structure of the commands available for the series channel is:
STX
Data
1
CHK
EOT
Where:
•
STX:
ASCII character 0x02 (STX). Start of frame.
•
Data:
Includes the code of the commands and the data necessary for their execution.
•
CHK:
Checksum of: 7 bits of the field
“
Data
”
. Calculation of the XOR of all the bytes of the
frame except STX and EOT. (Bit 7 always 1)
•
EOT:
ASCII character 0x04 (EOT). Indicates end of frame.
NOTE: To ensure correct transmission, all bytes transmitted which are not of synchronisation
(all except
STX
and
EOT
), will have the most significant bit set to 1.
15.2.
Series channel commands
The commands available are the following:
PLAY VOICE MESSAGES IN THE CAR
The control system or other devices such as the graphical viewer transmit this frame to the
emergency telephone so that it generates a synthesized voice message audible in the car.
N
º
Pin
Function
3
485-B
4
485-A
5
GND
