
First version
Rev 1.00
22 Sep 2016
Helios User Manual
16
Status: 16-bit Register
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
C
over
A
ck.
Scal
e A
ck.
U
ndef
ined C
m
d.
Exp. T
im
e E
rr
o
r
Sensor
Too H
ot
Me
as
. C
om
p
le
te
Me
as
. i
n P
rog
res
s
Me
as
. R
ea
dy
(Spar
e)
(Spar
e)
(Spar
e)
C
over
O
ther
E
rr
or
C
over
T
im
eout
C
over
in Mo
tion
C
over
C
lose
d
C
over
O
pen
NOTE: In Big Endian mode, the UPPER (top) byte is output first (byte 1). In Little Endian mode, the bytes
are swapped over and the LOWER byte is output first (byte 0).
NOTE: In earlier versions of this manual the “Cover” was referred to as the “Shutter”.
NOTE: Items displayed in red have been added in Helios firmware version 1.13, Sept. 2020
Bit
Byte
Register
Length
Read/Write
0
0
Cover is open
1 bit
Read
1
0
Cover is closed
1 bit
Read
2
0
Cover in motion
1 bit
Read
3
0
Cover timeout error
1 bit
Read
4
0
Cover other error
1 bit
Read
5
0
(Spare)
1 bit
Read
6
0
(Spare)
1 bit
Read
7
0
(Spare)
1 bit
Read
Bit
Byte
Register
Length
Read/Write
8
1
Sensor is ready to measure laser
1 bit
Read
9
1
Laser measurement in progress
1 bit
Read
10
1
Laser measurement complete
1 bit
Read
11
1
Sensor is too hot; let device cool 10-20 minutes
1 bit
Read
12
1
Exposure time error
1 bit
Read
13
1
Undefined command
1 bit
Read
14
1
Change in parameters – acknowledge (* Note 1)
1 bit
Read
15
1
Cover command – acknowledge
1 bit
Read
* Note 1: This bit is set when changing any parameter using one of the commands defined below, for example energy
scale or laser option.
Constants:
Byte
Register
Units
Length
Read/Write
2-5
Maximum energy that can be measured
mJ
4 bytes
Read
6-9
Minimum energy
mJ
4 bytes
Read
10-11
Maximum exposure time
ms
2 bytes
Read
12-13
Minimum exposure time
ms
2 bytes
Read
14-15
Maximum power
W
2 bytes
Read
16-17
Minimum power
W
2 bytes
Read
18-19
Maximum allowed temperature of Helios
°C
2 bytes
Read
20-21
Number of supported laser options (* Note 2)
N/A
2 bytes
Read
* Note 2: See details of laser option control below