PPA5xx/15xx user manual
5-9
commands that expect a reply are terminated with a
question mark.
Data values returned by the PPA5xx/15xx are in scientific
notation, with a 5-digit mantissa by default.
There is also an option for higher speed data transfer by
selecting resolution = ‘binary’ where each value is
returned in 4 bytes, each of which has the msb set so that
it will not be interpreted as an ASCII character.
2’s complement signed exponent
bit 6 = mantissa sign
bit 5:0 = mantissa bits 19:14
When the msbs are stripped off and the bytes put
together, there is 6 bit signed exponent, a mantissa sign
bit and a 20 bit mantissa magnitude. The value then is
given by:
Value = +/- 2^exponent x mantissa / 2^20
The PPA5xx/15xx maintains an error status byte consistent
with the requirements of the IEEE488.2 protocol (called
the standard event status register) that can be read by the
mandatory command *ESR? (See section 5.1).
The PPA5xx/15xx also maintains a status byte consistent
with the requirements of the IEEE488.2 protocol, that can
be read by the mandatory command *STB? over RS232,
USB or LAN (see section 5.2).
Setting the LAN IP address to 0.0.0.0 will enable the DHCP
and the unit will obtain its IP-Address from the DHCP
server. DHCP server must be present on the network for
this to work. The LAN will not start normal operation until
it receives an IP address from the server.
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