AMX TXC16 Plus Specifications download pdf (Page 123)

SG-2000 MANUAL 116

The SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA

If an ALE system is linked, and operation of the link is disrupted through

random noise or deliberate jamming, the controllers will establish communi-

cations on another channel. This function, called link protection, is controlled

export technology and may not be exported to other countries without a permit

issued by the U.S. Department of State. In addition, export of ALE controllers to

certain countries is banned. Contact SGC directly for the current list of banned

countries.

The controller supplied by SGC will provide for three modes of orderwire.

These three modes use a low speed 75 baud data circuit which operates

substantially below the lowest usable voice channel quality by application of

digital signal processing to literally pull signals out of the noise.

The Automatic Message Display allows for the display of alpha-numeric text

messages of up to 80 characters in length. The Data Text Message mode allows

stations to communicate messages between any selected stations for direct out-

put to or from associated DTE devices. (This facility also allows for error-free

transmission of text files and computer files which include the full ASCII

character set.) The Data Block Message mode is a high speed means of

transferring orderwire messages with improved performance against long fades,

noise bursts, and — to a degree — electronic counter measures.

18.2 Serial Communication Protocol

The SG-2000 communicates with the ALE controller via a serial communications

port on the controller and the RS-232 serial port (D-subminiature 9 pin

connector) on the rear panel of the SG-2000. The SG-2000 serial line parameters

are preset to 9600 baud, 8 bits, no parity, and one stop bit.

All SG-2000 remote control commands consist of five parts as follows:

1. The "ATTENTION" signal. This consists of forcing the serial control line

into a "break" (or "SPACE" [+V]) condition for a period of approximately

10 mS. This is then followed by a similarly 10 mS. period of a "MARK'" [-

V] condition.

2. ID/Byte Count. This consists of a single 8 bit character. The upper 4 bits

should be set to zero to identify this as a command from a "computer"

interface. The lower 4 bits are used to indicate the number of bytes to

follow but not including the checksum byte. The range of this value will

be from 01 ( byte 1) to 0F ( byte 15).

3. Command Code. The ALE controller requires the use of only three of the

many commands available under the SG-2000 control system: RESET,

STORE, and RECALL.

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AMX TXC16 Plus Specifications Page 123