6.2.5
Command Message Format
<STX> address command <ETX> checksum
Command message with no qualifying data.
<STX> address command data <STX> checksum
Command message including a qualifying parameter
6.2.6
Response Message Format
All valid command messages are acknowledged in the following forms. The address and command
characters are a reiteration of those in the command message.
<ACK> address command <ETX> checksum
Simple acknowledgment.
<ACK> address command data <ETX> checksum
Acknowledgment with data.
Any unrecognised or un-executable commands will be acknowledged in the form shown below.
<NAK> address command data <ETX> checksum
Not acknowledged, with explanation for the command rejection.
Any command containing a parity, farming, overrun, or checksum error will be ignored and
consequently the master must reissue the command.
6.2.7 Message
Timing
The maximum time between each character of a message must not excess 10 ms, and a pause of
10mS minimum should be inserted after a command message to allow units to recognised bus
inactivity between commands.
6.2.8
Summary of Command Messages
Message
ASCII
Hex
Type (see below)
Amplifier type?
0
30
US
Status? 1
31
US
Enable manual redundancy mode
5
35
UC
Enable auto redundancy mode
6
36
UC
This amplifier to antenna
7
37
UC
This amplifier to load
8
38
UC
Select RF band
9
39
UC+p
Set low power alarm
A
41
UC+p
Set high power alarm
B
42
UC+p
Warm-up time?
C
43
US
Set attenuator
D
44
UC+p
Enable RF
E
45
UC
Helix record top of file
F
46
UC
Next helix current record?
G
47
US
Helix current?
H
48
US
Input power? (see note)
I
49
US
Elapsed hours?
J
4A
US
Go to local
L
4C
UC
RF band setting?
M
4D
UC
Inhibit RF
N
4E
US
Off O
4F
UC
Forward power?
P
50
US
Remote enable
R
52
UC
Standby S
53
UC
Reflected power?
T
54
US
© e2v technologies (uk) limited 2010
DAS768892AA
Version
1,
page
29
