AMX Codec Master Control System Instrucciones de operaciones descargar pdf (Pagina 16)

LecNet SERIAL PORT PROTOCOL

All LecNet devices use a modification of the typical one-to-one connection between two RS-232 compatible devices.

LecNet devices have both an RS-232 transmitter and receiver section. The transmitter section is “tri-stated”, or

placed in a high impedance mode, until the particular device is addressed. To facilitate the simple parallel connection

of multiple devices on a single RS-232 port, an addressing scheme is employed to route commands from the host to

the proper LecNet device. When a device receives its address from the host computer, it temporarily turns on its RS-

232 transmitter long enough to send whatever data is requested by the host. In this way, multiple devices may drive a

single transmit signal back to the host, because only the addressed device will turn on its transmitter.

Valid address values are 128-254 (80 hex-FE hex). Because a LecNet device will interpret any single data byte

whose value is greater than 127 as an address, single byte data (as opposed to addresses) sent from the host must

be in the range of 0-127. If a data value needs to be sent from the host that exceeds 127, the host must format two

bytes of output such that the first byte is the lower 7 bits of the 8 bit value, and the second byte is 1 if the MSB of the

data byte is 1, or 0 if the MSB of the data byte is 0.

All interchange of commands and data with any LecNet device is done numerically rather than ASCII. The only

exception to this is the return data on the Get Device Name command (see command description below). Each

LecNet command must be preceded by the address of the device to be controlled. If a device with the requested

address exists on the system, it will respond by sending a 0 (0 hex, not ASCII) back to the host. Thus, each inter-

change with a LecNet device follows this pattern:

1) Host sends device address as a single byte.

2) Host receives byte of 0 hex from the LecNet device as acknowledgment.

3) Host sends command (1 byte) to the LecNet device.

4) Host and LecNet device exchange data based on particular command sent.

Note that some LecNet commands cause LecNet devices to return an additional acknowledgment byte of data to

confirm the end of a transaction. This is most typical of commands that cause the LecNet device to be busy for more

than a few milliseconds processing the command. The additional acknowledgment byte lets the host know that the

LecNet device is no longer busy and can receive more commands. If a command does return an additional acknowl-

edgment byte, this will be explicitly stated in the command description.

As an example of a specific interchange between a host and a TH3, the following general procedure would be used

to get a name string back from the TH3.

Set up the communications parameters of the device which will be the host. The correct parameters for all LecNet

devices are 9600 baud, no parity, 8 data bits, 1 stop bit. This need only be done once when the host is initialized.

1) Host sends the device address of the TH3 (133 or 85 hex, by default).

2) Host receives byte of 0 hex from the TH3 as acknowledgment.

3) Host sends command 1 hex (1 byte) to the TH3 to get the name data.

4) The TH3 sends to the host 4 bytes. The first byte is 3 hex, which is the number of bytes in the TH3’s name string.

The TH3 will then send the ASCII characters “T”, “H”, and “3” to the host.

The following section is a listing of available TH3 commands. The word “Host” in the command descriptions means

the IBM PC or compatible, AMX controller, or Crestron controller to which the TH3 is connected. All numbers are

decimal unless otherwise specified.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 27 28

Comentarios a estos manuales

Sin comentarios

Philips VKR 9015 Manuel de l'utilisateur (50 pages)

marque: Philips | Catégorie: No info | Taille: 2.56 MB |

Table des matières

Plus de produits et de manuels pour Non Philips

Modèles	Type de document
SA3215	Manuel de l'utilisateur Philips SA3215 User's Manual, 17 pages
VR703	Manuel de l'utilisateur Philips VR703 User's Manual, 38 pages
AZ 9610	Manuel de l'utilisateur Philips AZ 9610 User's Manual, 15 pages
SBC BC700	Manuel de l'utilisateur Philips SBC BC700 User's Manual, 1 pages
SYK3600/00	Manuel de l'utilisateur Philips SYK3600/00 User's Manual, 19 pages
VR6485	Manuel de l'utilisateur Philips VR6485 User's Manual, 24 pages
AZ2808	Manuel de l'utilisateur Philips AZ2808 User's Manual, 19 pages
VIDEO LINE VR 266	Manuel de l'utilisateur Philips VIDEO LINE VR 266 User's Manual, 2 pages
AZ6812	Manuel de l'utilisateur Philips AZ6812 User's Manual, 17 pages
AJ3280	Manuel de l'utilisateur Philips AJ3280 User's Manual, 8 pages
47PFL7409/98	Manuel de l'utilisateur Philips 47PFL7409/98 User manual, 12 pages
AQ4150/14S	Manuel de l'utilisateur Philips AQ4150/00 User manual, 11 pages
SE4352S	Manuel de l'utilisateur Philips SE4352S User's Manual, 2 pages
AE3650/03	Manuel de l'utilisateur Philips AE3650/03 User's Manual, 22 pages
AJ 3720	Manuel de l'utilisateur Philips AJ 3720 User's Manual, 16 pages
RD0946	Manuel de l'utilisateur Philips RD0946 User's Manual, 16 pages
M1351A	Manuel de l'utilisateur Philips M1351A User's Manual, 189 pages
VR253	Manuel de l'utilisateur Philips VR253 User's Manual, 28 pages
AE2630	Manuel de l'utilisateur Philips AE2630 User's Manual, 3 pages
AQ 6481/01P	Manuel de l'utilisateur Philips AQ 6481/01P User's Manual, 2 pages

AMX Codec Master Control System Instrucciones de operaciones Pagina 16

Comentarios a estos manuales

Philips VKR 9015 manuels

Philips VKR 9015 Manuel de l'utilisateur (50 pages)

Table des matières

Plus de produits et de manuels pour Non Philips

AMX Codec Master Control System Instrucciones de operaciones Pagina 16

Comentarios a estos manuales

Relacionado con productos y manuales para Software AMX Codec Master Control System

Philips VKR 9015 manuels

Philips VKR 9015 Manuel de l'utilisateur (50 pages)

Table des matières

Plus de produits et de manuels pour Non Philips