Smart Avi SmartNet-V - Manual (Page 24)

Page 24 MNSNV102005Ver1.0
Chapter 6: Communication Protocol Chapter 6: Communication Protocol Chapter 6: Communication Protocol Chapter 6: Communication Protocol Chapter 6: Communication Protocol
In order to ensure good communications it is essential that the Hex address switch on the front of the SmartNet-V is
set correctly. The hex switch can be adjusted using a small flat head screwdriver.
An incorrect setting or having more than one chassis set to the same address will result in comms errors.
6.0 P 6.0 P 6.0 P 6.0 P 6.0 Paaaaaccccckkkkket Structure et Structure et Structure et Structure et Structure
The general form of packets sent to the SmartNet-V switches are detailed below;
<<<< H H H Heeeeead ad ad ad ader Byt er Byt er Byt er Byt er Byte 0 e 0 e 0 e 0 e 0>< >< >< >< > Head Head Head Header B er B er B er B er Byyyyyttttteeeee 1 11 11>< >< >< >< > ram ram ram rameeeee Add Add Add Add Address> ress> ress> ress> ress> serve serve serve served dd d d> > > > > MD MD MD MD>< >< >< >< > D D D DA A A A ATA TA TA TA TA BY BY BY BY BYTE TE TE TE TES> S> S> S> S>
Where ;
<<<< H H H Header Byte 0 eader Byte 0 eader Byte 0 eader Byte 0 eader Byte 0>>>>> Always 0xBE
<<<< H H H Header Byte 1 eader Byte 1 eader Byte 1 eader Byte 1 eader Byte 1>>>>> Always 0xEF
dd d dress ress ress ress ress>>>>> Frame address. Set by Hex switch on front of unit.
dd d d>>>>> Reserved for future use (Always 0x00)
<<<< C C C CMD MD MD MD MD>>>>> Command byte – Determines the number of bytes in DATA BYTES
BB B BYT YT YT YT YTE EE EESSSSS>>>>> Number of bytes for associated CMD
<<<< BCC> BCC> BCC> BCC> XOR of all bytes in the string up to but not including BCC
On receipt of a valid data packet the SmartNet-V will either respond with an ACK (0x06) or a valid packet containing
the requested data.
7.0 Imp 7.0 Imp 7.0 Imp 7.0 Imp 7.0 Implllllemented Comm emented Comm emented Comm emented Comm emented Commaaaaands @ 18/11 nds @ 18/11 nds @ 18/11 nds @ 18/11 nds @ 18/11/////2003 2003 2003 2003 2003
No No No No Note te te te te::::: Commas shown in example byte strings below are not transmitted from the serial port they have only been added only
to aid legibility.
5.0 SmartNet-V Frame Switches 5.0 SmartNet-V Frame Switches 5.0 SmartNet-V Frame Switches 5.0 SmartNet-V Frame Switches 5.0 SmartNet-V Frame Switches
The communications port on the SmartNet-V allows for multiple chassis to be connected
together.
This is achieved by creating a loop between chassis using the comms IN and OUT ports on the front of the chassis.
i.e.
s s e r d d A s s e r d d A s s e r d d A s s e r d d A s s e r d d A
h c t i w S x e H h c t i w S x e H h c t i w S x e H h c t i w S x e H h c t i w S x e H
g n i t t e S g n i t t e S g n i t t e S g n i t t e S g n i t t e S
00000 00000
11111 11111
22222 22222
33333 33333
44444 44444
55555 55555
66666 66666
77777 77777
88888 88888
99999 99999
0 10 10 10 10 1 A A A A A
1 11 11 11 11 1 B BBBB
2 12 12 12 12 1 C C C C C
3 13 13 13 13 1 D D D D D
4 14 14 14 14 1 EEEEE
5 15 15 15 15 1 FFFFF