Tsunami Mode-Locked Ti:sapphire Laser
8-16
Lok-to-Clock Computer Interface
The Lok-to-Clock computer interface allows for computer control and
monitoring by any computer which has an RS-232 interface. Communica-
tions are at 9600 baud, with no parity, 8 data bits, and one stop bit, using
the XON/XOFF protocol.
The 9-pin D-subminiature connector is designed for easy use with “PC-
compatible” computers. A one-to-one, 9-wire “extension” cable, available
from your local supplier, should be all that is required. Here are the pin def-
initions, in case you need to build your own cable:
The same pinout is used on the Model 3931 long-range phase shifter (2π
shifter ∼12 ns of delay). If you have purchased a Model 3931, connect the
extension cable from the TO 3930 connector on the Model 3931 to the RS-
232
input connector on the Model 3930, and attach your computer to the
RS-232 connector of the Model 3931.
The Model 3930 Command Set
The table below lists the RS-232 commands and queries for the Model
3930. The sections that follow describe each command in detail. These
commands and queries follow the Standard Commands for Programmable
Instruments, or SCPI, standard. However, since the SCPI consortium did not
have lasers in mind when they developed the standard, many of these com-
mands are specific to the Model 3930 and are not part of the SCPI standard.
Also, only the “short” form, 4-letter command/query of the SCPI command
set is recognized by the Model 3930.
Pin Number Name Interpretation
2 TXD Data output from the Model 3930
3 RXD Data input to the Model 3930
5 SIGGND Signal ground
Table 8-1: The SCPI Command Set
SOURce STATus SYSTem *CLS
:LOOP :OPERation :ERRor? *ESE
:LOOP? :EVENt? :VERSion? *ESE?
:LMON :CONDition? *ESR?
:DC? :ENABle *IDN
:AC? :ENABle? *OPC
:PZT :QUEStionable *OPC?
:DC? :EVENt? *RST
:AC? :CONDition? *SRE
:DLY :ENABle *SRE?
:DLY? :ENABle? *STB?
:LDLY :PRESet *TST?
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