LAMBDA DG-4 & 5 PLUS/USB OPERATION MANUAL – REV.
80
Command Tx/
-Rx
Ver.
Byte
Count
Byte
Offset
Value
Alt-
key-
pad
entry
Ctrl-
char
ASCII
def./-
char.
Description
Dec. Hex. Binary
6
DAC value
Nominal filter 2
8
DAC value
Nominal filter 3
10
DAC value
Nominal filter 4
12
DAC value
Nominal filter 5
14
DAC value
Nominal filter 6
16
DAC value
Nominal filter 7
18
DAC value
Nominal filter 8
20
DAC value
Nominal filter 9
22
DAC value
Nominal filter 10
24
DAC value
Nominal filter 11
26
DAC value
Nominal filter 12
28
DAC value
Nominal filter 13
30
DAC value
Nominal filter 14
32
DAC value
Nominal filter 15
34
13 0D 0000 1101
<CR>
Completion indicator
Get
System
Status &
Configu-
ration
Tx USB
1
0
253 FD 1111 1011 0253
Command byte
Rx USB
17
0
Echoed command sequence
1
Controller description as an ASCII
sequence: “DG4/5”
6
Firmware version as an ASCII
sequence. E.g., “V1.12”.
11
SmartShutter installation status:
“SS-ON” (installed) or “SS-NC” (not
installed)
16
13 0D 0000 1101
<CR>
Completion indicator
NOTES:
1.
A short delay (usually around 1 ms) is recommended between commands (after the reception of one
command and the sending of the next command).
2.
All values greater than one byte (8 bits) transmitted to, and received from, the Lambda DG-4/5
Plus/USB consist of two bytes ordered in “Little Endian” (least significant byte last) format (see
NOTE 3). The value stored in these two bytes is always unsigned, meaning that the value will
always be positive (negative values are not allowed). These two bytes are converted to and from 16-
bit “unsigned short” (C/C++) or “U16” (LabVIEW) value storage entities.
3.
“Little Endian” means that the least significant byte is last (last to send and last to receive). Byte-
order reversal may be required on some platforms (e.g., LabVIEW always handles “byte strings” in
“Big Endian” byte order, requiring that the two bytes containing a DAC value be reverse-ordered
before conversion into a 16-bit “unsigned short” (or “word”) value). Whereas Microsoft Windows,
Intel-based Apple Macintosh systems running Mac OS X, and some Intel/AMD processor based
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