Application Layer (AlphaCom Data Protocol)
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Contents
Application Data
AlphaCom class messages
TouchLine class messages
SNMP-like class messages
Site specific (engineering use) class messages
Data Types
The following table identifies the data types used in the application data of the AlphaNet Data Protocol:
| Data Type | Definition |
|---|---|
| UINT1 | 8 bits (one byte) |
| SINT1 | 1-byte signed integer |
| UINT2 | 2byte unsigned integer. MSB first |
| UINT4 | 4byte unsigned integer. MSB first |
| BITMAP[1..n] | nbits bitmap (multiple of 8). Always fills whole bytes. <br\>- Unused bits in last byte is set to 0. <br\>- First bit is the most significant (leftmost) bit in first byte.<br\>- Bits are numbered from 1, a byte contains bits 1..8. |
| VBITMAP[1..n] | Variable length bitmap with n bits. (n is a multiple of 8.)
Structure:<br\>UINT1 - containing the number of bytes in the following bitmap. <br\>bitmap - always fills whole bytes. <br\>- Unused bits in last byte is set to 0. <br\>- First bit is the most significant (leftmost) bit in first byte. |
| TEXT16 | 16 characters (bytes) of text. Padded with spaces. <br\>ASCII values >= 32 (0x20) only. |
| CLOCK | Date & time structure:<br\>UINT2 Year (yyyy)<br\>UINT1 Month (mm)<br\>UINT1 Day (dd)<br\>UINT1 Hour (hh)<br\>UINT1 Minutes (mm)<br\>UINT1 Seconds (ss) |
| NET_OBJ_REF | AlphaCom Intercom Object Reference. <br\>Can both encode directory numbers and physical numbers |
Network Object Reference (NET_OBJ_REF)
Further information: Network Object Reference
The NET_OBJ_REF is a “variant record” which has a header with byte count plus a type field.