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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
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.
REMOTE [n]
Remote only (front panel lock-out) control
Allowed values of n are 0 and 1. When n is equal to 1, the lock-in amplifier enters
remote only mode in which the front panel control functions are inoperative and the
instrument can only be controlled with the RS232, USB or Ethernet interfaces. When
n is equal to 0, the front panel controls function normally.
RS [n
[n
]]
Set/read RS232 interface parameters
1
2
n
Baud rate (bits per second)
1
0
75
1
110
2
134.5
3
150
4
300
5
600
6
1200
The lowest five bits in n
following table:
bit number bit negated
0
data = 7 bits
1
no parity bit
2
even parity
3
echo disabled
4
prompt disabled
Appendix F, ALPHABETICAL LISTING OF COMMANDS
n
1
7 1800
8 2000
9 2400
10 4800
11 9600
12 19200
13 38400
control the other RS232 parameters according to the
2
bit asserted
data = 8 bits
1 parity bit
odd parity
echo enabled
prompt enabled
Baud rate (bits per second)
F-19
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