Operation 25
CG635 Synthesized Clock Generator
ADDRS
This function sets the CG635’s primary GPIB address. The user can enter an address
using the numeric keys or the MODIFY
Ÿ
and
ź
keys. The address is not set until the
user presses the ‘Hz’ key. For example, to set the GPIB address to 23, press the keys
‘SHIFT’, ‘ADDRS’, ‘2’, ‘3’, ‘Hz’ sequentially. The CG635 will briefly display
‘Changed’ if the address changes.
The factory default GPIB address is 23.
RS-232
This function enables the RS-232 remote interface and disables the GPIB remote
interface. The CG635 will briefly display ‘Enabled’ after enabling the interface. This
function is not executed until the user presses ‘Hz’. The RS-232 LED in the
INTERFACE section of the front panel will be on when RS-232 is the selected interface.
The communication parameters are fixed at: 9600 Baud rate, 8 Data bits, 1 Stop bit, No
Parity, RTS/CTS Hardware Flow Control.
DATA
This function enables the user to see the most recent characters received by the CG635
over the remote interface. The characters are shown in hexadecimal format, with older
characters appearing to the left and newer characters appearing to the right. The last
character received is marked with the decimal point showing.
To move back and forth through the buffer, use the MODIFY
Ÿ
and
ź
keys.
Factory Default Settings
The factory default settings are listed in Table 15. The CG635 may be forced to assume
its factor default settings by power cycling the unit with the ‘BACK SPACE’ key
depressed. The INIT secondary function and the *RST remote command reset all but the
communication parameters back to factory default settings.
Table 15: Factory Default Settings
Parameter Setting
Frequency 10
MHz
Frequency step size
1 Hz
Phase 0°
Phase step size
1°
Q / Q
¯ high
1.43 V (LVDS)
Q / Q
¯ high step size
0.1 V
Q / Q
¯ low
1.07 V (LVDS)
Q / Q
¯ low step size
0.1 V
CMOS high
3.3 V (+3.3 V CMOS)
CMOS high step size
0.1 V
CMOS low
0.0 V (+3.3 V CMOS)
CMOS low step size
0.1 V
