2008:venus_protocol
This is an old revision of the document!
Table of Contents
Venus and Loge protocol
Venus functions as a gateway between a local 485 network and a remote master which is connected via a TNC and radio.
Addresses
All devices including Venus have a system address. When a received TNC packet is not for Venus, the packet is forwarded onto the local 485 network. Responses from the 485 network are forwarded back out the TNC to the calling party.
- 0x0 Downing Venus
- 0x80 BB Venus
- 0x81 BB Loge
Packet format
The packet format consists of:
| Offset | contents | description |
| 0 | 0x7F | Presynch1 |
| 1 | 0xFE | Presynch2 |
| 2 | 0xaa | Destination address |
| 3 | 0xnn | packet data length |
| 4 | 0xpp | Opcode |
| 5-n | 0xzz | data bytes |
| z1 | CRC Lo | CRC byte lo |
| z2 | CRC Hi | CRC byte hi |
2008/venus_protocol.1229361098.txt.gz · Last modified: 2008/12/15 12:11 by tomgee