iSource
®
StarLPRO-1500
Manual
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4.6.2 SERIAL INTERFACE CONNECTION
The data transfer from the STARLPRO-1500 can be made by direct connection to a PC or standard terminal.
The data transfer parameters are the following:
bit rate: 9600 bits/s.
parity: none
start bit: 1
data bits: 8
stop bit: 1
IMPORTANT NOTE
In most cases, the serial PC interface accepts the 0 to 5V level and a direct connection can be made.
In case this 0 to 5V standard is not working , please refer to the small adaptation circuit called ‘ RS 232 adapter
circuit’ described in annex I.
4.6.3 Standard RS-232 control & Monitoring commands
The operating and monitoring parameters of the StarLPRO-1500 are accessible for read and write operations
through the serial RS-232 port (9600 bits/sec., no parity, 1 start bit, 8 data bits, 1 stop bit).
There are 2 basics commands, which are
M
,
Cxxxx
M<CR><LF>
: monitors the basic internal signals of the atomic clock.
The returned answer looks like
HH GG FF EE DD CC BB AA
<CR> <LF>
Where each returned byte is an ASCII coded hexadecimal value, separated by a <Space> character. All
parameters are coded at full scale.
HH:
Read-back of the user provided frequency adjustment voltage on pin 2 (0 to 5V)
GG
: reserved
FF
:
peak voltage of Rb-signal (0 to 5V)
EE
:
DC-Voltage of the photocell (5V to 0V)
DD
: varactor control voltage (0 to 5V)
CC
: Rb-lamp heating current (Imax to 0)
BB
:
Rb-cell heating current (Imax to 0)
AA
:
reserved
Cxx
xx<CR><LF>:
output frequency adjustment through the synthesizer, by steps of 5.12
10
-13
, where
xxxx is a signed 16 bits word in hexa coded ASCII. This value is automatically stored in a EEPROM as last
frequency which is applied after RESET or power-ON operation.
In Track mode this correction is not in use. The function
FC
sddddd do the same.
Set
frequency
adjustment
FC
sddddd
<
CR
><
LF
>
s=+/- signe
ddddd = limited within range :
+32767/-32768
FC+99999 : interrogation
sddddd<CR><LF>
s: +/- signe
ddddd : frequ. Adj. in
5.12 x 10
-13
step
4.7
LOCK MONITOR and XTAL MONITOR OUTPUTS
The STARLPRO-1500
contains a ‘lock monitor’ function which consist in a monitoring of the internal parameters
