Spellman High Voltage Electronics Corporation One Commerce Park,
Valhalla, NY 10595, (914) 686-3600, Fax: (914) 686-2870
request responses (see section 3.2.6 and 3.2.7). The limit commands start with an ‘L’ followed by a
numeric string that represents the threshold value, then followed by a character that distinguishes between
the voltage and current limits. A’K’ indicates a kilovolt limit and an ‘M’ or ‘U’ indicates a milliamp or
microamp limit respectively. The syntax is:
‘L {numeric string} K’ Kilovolt Limit
‘L {numeric string} M’ Milliamp Limit, or
‘L {numeric string} U’ Microamp Limit
where {numeric string} is as described Table 3.0. It is very likely that the numeric formats for the voltage
and current will be different.
The voltage limit command uses the same numerical format as the programming command, but starts will
an ‘L’. Below are some examples:
Lx.xxxxK
L0.6523K limits to 652.3V
Lxx.xxxK
L29.400K limits to 29.4kV
The output current limit threshold may also be set. When this value is exceeded the 200-C488 will respond
as programmed by the user. This command also requires a strict numerical format. Since it represents
output current, the decimal point, may be in a different position than the voltage format. Below are some
examples of the current limit command.
Lxx.xxxM
L12.000M limits to 12mA
Lx.xxxxM
L1.0500M limits to 1.05mA
Lxxx.xxU
L473.50U limits to 473.5uA
The actual limit values will not change after the limit command until the 200-C488 receives a device
trigger bus command or the ‘G’ command string (see sections 3.1.4 and 3.2.3).
3.2.3
ENTERING THE CURRENT PROGRAMMING & LIMIT VALUES (‘G’)
After executing a programming or limit command, these new values will not be used immediately. The
user must execute the ‘G’ command that will update the current values with the new ones. Therefore, if the
output is currently programmed to 1kV and the user executes a program command such as ‘P1.5000K, the
output will not change until the ‘G’ command is executed. The syntax is:
‘G’ the single ASCII character
When timing is not important, the ‘G’ may be appended to the programming or limiting command as
shown below.
Pxx.xxxKG
lx.xxxxMG
3.2.4
SHUTTING THE HIGH VOLTAGE OUTPUT (‘R’)
The high voltage output may be turned back on to the currently active programming level after it was shut
off by a user command ‘S’ or a trip due to overload. The syntax. The syntax is:
‘S’ the single ASCII character
This is the same effect as executing the device clear bus command.
3.2.5
RESTORING THE HIGH VOLTAGE OUTPUT (‘R’)
The high voltage output will return to the value that was programmed before the shutdown. If the output is
off because of an overload trip, the cause of the overload should be corrected before restoring the output
voltage or the trip will occur again.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
