Hoffer Flow Controls HIT-2A, Руководство пользователя

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Appendix B
- Communications
39
HP-306
System
Command
Description/Response/Comments
SA
Set Alarm Output On
“ Alarm Active ”
Sets the alarm output active regardless of the settings.
US
Unit Status
"UNIT STAT = <DATA>"
Requests the status. The values for
<DATA>
with no or
only one error present are:
“0”
– No Errors present.
“128”
– EPULSE error (0x080)
“129”
– ETOTAL error (0x081)
“130”
– ERATE error (0x082)
“132”
– EFLOW error (0x084)
“129”
– EERES error (0x088) (EEPROM reset to
factory defaults)
If multiple errors occur, the error codes are logically OR-ed.
For example, if the unit has an ETOTAL and ERATE error
occurring at the same time, the
<DATA>
=
“131”
(0x83).
CS
Clear Status
" Status Cleared "
Clears all errors.
Note:
The CL and ST commands work as follows. The ST command shall
store the present value of the total in Non-Volatile memory. This total
in non-volatile memory shall be the initial total in the event that device
power is removed and then re-applied. The CL command will clear the
total in the device and the stored total in EEPROM but retain the
present total in a volatile (RAM) memory location and keep it as the
old total value. Removal of power from the unit causes this old total
value to be lost. When the HIT-2A receives the ST<CR> from the PC,
it shall echo back the old total value until the unit adds any value to the
present total. If the HIT-2A receives a second CL command, the old
total value shall be set to 0.