SIA DC-03-1990 (R2003)

The purpose of this standard is to establish a common signaling format, which can be adopted by any manufacturer of digital communicators or receivers. The standard communication format will provide an across-the-board compatibility of equipment desitgned to the Standard regardless of manufacturer.
This communication standard is designed to be open ended. The block format allows for a variable length on the account number and data sections of the message. The generalized message format allows for a theoretically unlimited length message in the form of multiple blocks (however, practical limits must be considered). The open ended design will allow for almost unlimited expansion within the provisions of the standard.