Timing; Global Command Responses; Druckbus Binary Mode Commands; Set Address - Fluke RUSKA 2456-LEM User Manual

RUSKA 2456-LEM
Users Manual
<Cmd>
<Parm x>
<Chk>
CR
<start>

Timing

Slaves must wait at least 1 character time before replying (for RS-485 line turnaround)
and must reply within 50 ms.

Global Command Responses

Units respond to Zero, the global address, the same as their assigned address. This means
that global addressing can be used when only 1 unit is on the bus.

DruckBus Binary Mode Commands

(Commands may be translated to Compatibility Mode for transmission)

@ - Set Address

Command:
Reply:
Command <Size>: 8
<NewAddr> is an 8-bit unsigned number. <Model> is a 2-byte integer containing the
model number, least significant byte first. <Value> is a 4-byte integer specifying a
pressure in kPa * 100 or a serial number, least significant byte first. Normally, this
command is sent using the global address. This command sets the address of the unit to
the specified address with the following conditions:
1. If the model number and value are both zero, all units receiving this command will
2. If the model number in the command is not zero and the model number of the unit
3. If the model number matches and if the pressure specified in the command is not zero
4. If the model number is zero, and a non-zero value is specified, and the value matches
These conditions allow for the addresses of each different model to be set individually
and the units of the same model to be set by pressure range. If two units have the same
model and pressure range the address can still be set by serial number.
9-2
Ascii
Binary
Ascii
Binary
Binary
Ascii
Compatibility Carriage Return required
Start
<start><addr><Size>@<NewAddr><Model><Value><Chk>
None.
set their address.
matches the specified model, the address is set.
and the full scale pressure of the unit is greater than, or equal to, the specified
pressure and the current address of the unit is 254 or 255, the address is set.
the serial number of the unit, the address is set.
2 Ascii characters specifying command.
1 Ascii byte specifying command (Uppercase on
command, lowercase on reply).
Variable-length Ascii formatted parameters.
Fixed-length binary parameter.
1 binary byte LRC (exclusive-or of all bytes including start)
Carriage Return required
Binary mode
Command = '&' ; Reply = '%'
Compatibility mode
Command = '$' ; Reply = '!'