Technical data

Installation & Operation Manual GM-TTT
Page 75
7.3 Serial Remote Control Interface
7.3.1 General
In this option, the standard RS485 module is replaced by a RS232 module (option 2) or a
RS422 module (option 4). With that GM-TTT can no longer work as a central unit of the MTD
system, because now the communication interface to the control units of this system is missing.
The GM-TTT may be partially remote-controlled via the serial RS232 or RS422 interface. The
current time code data may be requested. In the data format, 8 data bits and 1stop bit are
fixed, while parity bit and baud rate are adjustable.
The GM-TTT reacts to commands or requests. The received or sent data string has the
following structure:
Byte 1 Byte 2 Byte 3 Byte 4 ... Byte n+2 Byte n+3
CMD1 / DC CMD2 DATA 1 DATA 2 ... DATA n CHECK
CMD1 Command 1, specifies the group of commands:
0 = System control
4 = Set data
6 = Request data
DC Number of data bytes (Data Count), $0 - $F.
CMD2 Command 2, specifies the command within the group.
DATA 1... Data bytes, number as specified by DC.
CHECK hexadecimal sum of the bytes 1 to n+2 without carryover.
• A sent data string must be coherent, i.e. the time gap between individual bytes shall not
exceed >10 ms.
• A new command should only be transmitted if the return of the preceding command has
been received.
• Please note: unlike for operation with keys, new equipment settings are not
stored in the
non-volatile memory.