ETC Unison AV/Serial Interface v1.1.0 Quick Manual page 10

Q u i c k G u i d e :
Packet Mode Help
Packet Mode is a simple way to ensure that only full serial messages are executed at the
AV/Serial Interface station. Packet Mode requires a preamble to tell the station how many
bytes the command will be. As explained in
preamble is a single byte with the eight-bit set to one and the lower bits representing the
number of bytes. The single byte preamble is always greater than 128 and an ASCII code
that has no direct keyboard equivalent.
8 7 6 5 4 3 2 1
1 0 0 0 0 1 0 1
128 64 32 16 8 4
Below are examples of different command sizes and the required preamble. You can type
the preamble character by holding the Alt key while typing the 4-digit number listed while
using a terminal emulator such as Hyper Terminal. You will see the display character if you
have "local echo" turned on in your terminal application.
These are two important commands (including the preambles) to know. The parenthesis
and plus sign are not typed. They represent the characters to type while holding the Alt
key.
To turn off Packet Mode from within Packet Mode:
•
To turn on Echo Mode (which suspends Packet Mode):
•
In Hyper Terminal, you turn on "local echo" here:
Uni son AV/ Se r ia l I nt er f ac e v1 .1 . 0 Qui ck Gui de
Unison AV/Serial Interface v1.1.0 Quick Guide
Bi t L o c a ti o n
Bi n a r y N u m b er
Va l u e
2 1
Display Number
Alt +
Character of Bytes
0136 ê
0135 ç
0134 å
0133 à
0132 ä
0131 â
0130 é
0129 ü
♠
ACK
NAK §
(Alt+0133)SC5.0
(Alt+0133)SC1.1
Configuration Settings (nn.cf) on page
Command
8 byte S F 1 2
7 byte S F 1 0
6 byte S B 1 0
5 byte S C 5 .
4 byte G B 1 2
3 byte G F 3
2 byte G V
1 byte Esc
Successful
Unsuccessful
Pa ge 1 0 of 10
. 1 0 0
. 5 0
. 1
0
Packet Mode
Responses
El ect r on ic T he at r e Con tr o ls , I nc.
7, the