Appendix E, ALPHABETICAL LISTING OF COMMANDS
E-19
n status
128 D7 = input, D0 - D6 outputs
255 All lines configured as inputs
READBYTE Read digital port input
The response to the READBYTE command is an integer between 0 and 255
representing the binary value of all eight lines of the instrument rear panel digital
port. Hence, for example, if PORTDIR = 255 and the response to READBYTE is
255, then all lines are high, and if the response to READBYTE is 0, then all lines are
low. Note that because the command does not differentiate between whether a line is
configured as an input or output, it can be used as a single command to determine the
present status of all eight lines, both inputs and outputs, of the port.
REFMODE [n] Reference mode selector
The value of n sets the reference mode of the instrument according to the following
table:
n Mode
0 Single Reference / Virtual Reference mode
1 Dual Harmonic mode
2 Dual Reference mode
NOTE: When in either of the dual reference modes the command set changes to
accommodate the additional controls. These changes are detailed in section 6.7.14
REFMON [n] Reference monitor control
The value of n sets the function of the rear panel TRIG OUT connector according to
the following table:
n Mode
0 Trig Out signal is generated by curve buffer triggering
1 Trig Out signal is a TTL signal at the reference frequency (i.e. it is a Reference
Monitor output)
REFN [n] Reference harmonic mode control
The value of n sets the reference channel to one of the NF modes, or restores it to the
default 1F mode. The value of n is in the range 1 to 127.
REFP[.] [n] Reference phase control
In fixed point mode n sets the phase in millidegrees in the range ±360000.
In floating point mode n sets the phase in degrees.
RS [n
1
[n
2
]] Set/read RS232 interface parameters
n
1
Baud rate (bits per second) n
1
Baud rate (bits per second)
0 75 7 1800
1 110 8 2000
2 134.5 9 2400
3 150 10 4800
4 300 11 9600
5 600 12 19200
6 1200 13 38400
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