8-4
ECL-210 Operation Manual
8.3. Control Commands
The table below lists the control commands specific to the ECL-210 which can be implemented using
either the GPIB or RS-232C protocols. A command consists of two letters and may be written in
either upper or lower case. As appropriate, the commands can be issued with or without a numerical
suffix. A delimiter must be attached to the end of each command to ensure correct execution and
termination of each command line. The delimiter required for GPIB operation is CR+LF. The
delimiter required for RS-232C operation can be CR, LF or CR+LF. This delimiter is set in the
factory to CR and this can be changed during the ‘Power On’ procedure; for details see Section 7.1
Power On.
To access individual units in the MLS-2100 or MLS-8100 racks it is necessary to prefix the
command with a slot indicator; for example the command "B:WA1550.120" sets the
wavelength of the ECL-210 unit in slot B of the rack to 1550.120nm. The MLS-2100 has two
slots A and B, the MLS-8100 has eight slots indicated by the letters A to H.
To read data from the ECL-210 it is first necessary to set the output parameter to the required data
parameter. When subsequent read commands are issued the data corresponding to the set paramter is
output. In RS-232C communication “echo-back” is used to verify correct communications. Once the
output paramter has been set the DI command is used to request data from the unit. In both GPIB and
RS-232C protocols when a command is issued that cannot be interpreted the ECL-210 outputs “NR” to
the next data request. This output stops when a valid command is received.
Command
Description
Format
LO
Switches LD injection current on.
LO
LF
Switches LD injection current off.
LF
Sets output variable to indicate actual wavelength.
WA
Sets wavelength to a specific value (nm).
WA xxxx.xxx
Sets output variable to indicate target wavelength (nm).
WAT
Sets output variable to indicate actual optical power (dBm).
OP
Used with APC control, sets target optical power (dBm).
OP xx.xx
Sets output variable to indicate target optical power (dBm).
OPT
OP
WA
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