Teledyne HPM-2002-OBE instruction manual Calibration Adjustment Commands, Reset / Restore Commands

The setpoints may also be entered as a decimal number, e.g. [H=760.99<CR>] will be same as entering [H=7.6099E+2<CR>] .

When inputting setpoint data, it should be entered in the same Units of Pressure as the presently selected Units of Measurement (i.e. Torr, mbar or Pascal). The data is only checked to be a valid number with a one digit exponent before being accepted. There are no limit checks on the data; the user is free to choose any value appropriate to his use of the instrument.

The Turnaround Delay and RS-485 address are unique to multipoint communications. In order to prevent inadvertent modifications of these parameters, the multipoint attention character and the Model 2002’s present address [*{aa}] MUST be used and are checked for validity before the command is executed.

If the RS-485 address is unknown, the ‘UNIVERSAL ADDRESS’ [*00] may be used to set the address to a known value, e.g. [*00A=35<CR>] will change the RS-485 address to 35.

Caution: Since all units will respond to the ‘UNIVERSAL ADDRESS’, make sure that only the unit to be modified is connected to the RS-485 Bus. If more than one unit is connected, this will result in all of the units being set to the same address.

The ‘UNIVERSAL ADDRESS’ is used for setup only; (i.e. to set all units to the same gas #) data is never transmitted when the ‘UNIVERSAL ADDRESS’ is used.

The value entered for the Turnaround Delay is used to modify an internal timer which normally runs at ~8 millisecond, e.g. [*{aa}T=10<CR>] will set the delay to ~80 milliseconds.

If the command syntax is not met or if the number is out or range, the HPM-2002 will respond with the ASCII codes for <bell>?<CR>, and the command will be ignored.

3.3.5.Calibration Adjustment Commands

Command Description	Format	Valid Range:
Set Full Scale Calibration	CF={m.d}E{e}<CR>	5.12e+2	to 1.023e+3 Torr
		6.83e+2	to 1.365e+3 mbar
		6.83e+4	to 1.365e+5 Pascal
Set Midpoint Calibration	CM={m.d}E{e}<CR>	4.00e+0	to 7.999e+0 Torr
		5.34e+0	to 1.066e+1 mbar
		5.34e+2	to 1.066e+3 Pascal
Set Low Scale Calibration	CL={m.d}E{e}<CR>	0 to 1.2499e-1 Torr
		0 to 1.666e-1 mbar
		0 to 1.666e+1 Pascal

Notes:

The calibration adjustment data may also be entered as a decimal number, e.g. [CF=760.99<CR>] will be same as entering [CF=7.6099E+2<CR>].

When inputting calibration adjustment data, it must be within the valid range of the presently selected Unit of Measurement (i.e. Torr, mbar or Pascal). The data is checked to be valid before being accepted.

If the command syntax is not met or if the number is out or range, the HPM-2002-OBE will respond with the ASCII codes for <bell>?<CR> and the command will be ignored.

The ‘UNIVERSAL ADDRESS’ may be used to calibrate all connected units simultaneously, e.g. [*00CF=760<CR>].

3.3.6.Reset / Restore Commands

Command Description	Format	Notes:
Escape	<Esc>	Reset Command Buffer (ignore prior Input)
Software Reset	/R<CR>	Reinitialize Software
HPM-2002-OBEVacuum Gauge		Page 19 of 39