CTD-N Technical Manual
page 128
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
SAOP
The SAOP command enables address operation. Once address operation is enabled, an instrument
will respond to commands until a # character is sent. After this time, the instrument will ignore all
commands until the instrument receives the string #Nxy (where xy is the instrument’s address as
set by the ADR command). After the instrument receives a valid address, it will respond to com-
mands until another # character is sent. For example, if ADR=05, use #N05.
Note: The SAOP command must be followed by the ***E command to save the setting.
CAOP
The CAOP command disables address operation.
CAUTION. The CTD-N unit must be addressed via the command #N
xy
before address operation can be
disabled via the CAOP command. Follow the example shown below for
Open
mode; otherwise if you
send the CAOP command with more than one unit connected in the chain, all of the CTDs will be talking
over each other on the serial communication line.
Note: The CAOP command must be followed by the ***E command to save the setting.
RAOP
The RAOP command reads the address operation.
Address op set, Adr = xy
Address op cleared, Adr = xy (where xy is the address number 0 to 99)
Returns
The state of the address mode
Examples
Using #nxy (where xy is the address number 0 to 99) while in Run mode will return a single sam-
ple without having to manually “de-address” the unit afterwards. For example, if you have several
CTDs in a chain, while they’re all running, you could just read each unit once by sending:
#n00
+0.3388, +21.8176, -0.0200, +00.1742, +1488.0041 (unit 00 returns this data)
#n01
+0.3388, +21.8178, -0.0201, +00.1743, +1488.0046 (unit 01 returns this data)
#n02
+0.3390, +21.8181, -0.0221, +00.1744, +1488.0057 (unit 02 returns this data)
…etc.
However, if you need to control/configure multiple units in Open mode, then you’ll have to enter
multiple commands (note you MUST use an uppercase “N”):
#N00
(address/unlock unit 00)
***O
(change to open mode)
ROP
(review configuration)
Etc. etc. to change something in the configuration
***R
(to restart run mode)
#
(to de-address the unit)
#N01
(address/unlock unit 01)
***O
(change to open mode)
ROP
(review configuration)
Etc. etc. to change something in the configuration
***R
(to restart run mode)
#
(to de-address the unit)
… And so on…
See Also
ADR, SFRM
