Wavelength Electronics LFI-3751, User Manual

Page: 81 / 132

Chapter 4 - Remote Interface Reference
RS-232 Command and Response Packet Formats
81
4
Command Packet
Response Packet
Data
±
X X X X X X
.
Command
Start
Unit
Type Unit #
Command
Code FCS
Command
Type
Data
±
X X X X X X
.
Response
Start
@
Unit
Type
1
Unit #
Command
Code FCS
Command
Type
End
Code
CR LF
Command Start
Response Start
Unit Type
[Decimal]
Unit #
[Decimal]
Command Type
[Decimal]
Command Code
[Decimal]
End Code
[Decimal]
Data
[Decimal]
FCS
[HEX]
CR LF
!
@
1 - 2
01 - 99
1 - 2
00 - 99
00 - 99
±
XXX.XXX
00 - FF
Signifi es the start of a Command Packet.
Signifi es the start of a Response Packet.
1 = Temperature Controller
2 = Laser Diode Driver
RS-232 address of the unit as set on the
front panel of the unit (00 is reserved)
1 = Read data
2 = Write data
Specifi es the type of command to initiate.
See “Command Code Listing” for detail.
Response indicating action success or
failure. See “End Code Listing” for detail.
Data must match this format exactly. A
sign character is followed by three digits,
a decimal point, and three digits. Data
is decimal and between -999.999 and
+999.999.
Number used to check the data received
and sent. See “Calculating FCS” for detail.
Carriage Return and Line Feed included
in Response Packet .
! 1 X X X X X X X
X X X X X X X X X
Data Field Characters
7 6 5 4 3 2 1 0
Data Field Characters
7 6 5 4 3 2 1 0