Specifications

Quintech Electronics and Communications Inc. Protocol Version 2.15 18

SRX Series Protocol

Negative Responses:

Occasionally, the matrix will be unable to carry out a command due to various reasons. The

NAK reply set is provided to help determine where the error occurred. A NAK reply will be

sent after the matrix has received the CHK byte.

x: Checksum Incorrect

This reply is sent when the checksum sent by the computer controller is different from the one

calculated by the matrix controller. This message would indicate data has been corrupted

during transmission.

Negative response sent:

15 XX XX 78 03 XX

NAK ADR ADR x ETX CHK

c: Command Unrecognized

This type of error message occurs when the matrix receives an unspecified command. The

unit will respond as specified below.

Negative response sent:

15 XX XX 63 03 XX

NAK ADR ADR c ETX CHK

u: Command Unavailable

This type of error message occurs when the matrix receives command that is not

implemented or can’t be done on a particular system or at a particular time. The unit will

respond as specified below.

Negative response sent:

15 XX XX 75 03 XX

NAK ADR ADR u ETX CHK