Remote Control - Commands
NRP2
300
User Manual 1173.9140.02 ─ 07
NTRansition register
The Negative TRansition register also acts as a transition filter. Upon transi-
tion of a bit of the CONDition register from 1 to 0, the associated NTR bit
determines whether the EVENt bit is set to 1.
NTR bit = 1: the EVENt bit is set.
NTR bit = 0: the EVENt bit is not set.
This register can be written to and read. Reading the register does not
change its contents.
With the aid of these two transition filter registers the user can define the sta-
tus change of the CONDition register (none, 0 to 1, 1 to 0 or both) that is to
be recorded in the EVENt register.
EVENt register
The EVENt register reports whether an event has occurred since its last
reading; it is the "memory" of the CONDition register. It only registers events
that have been reported by the transition filters. The EVENt register is contin-
uously updated by the device.
It can only be read by the user. Reading this register clears its contents.
This register is frequently referred to as the overall register.
ENABle register
The ENABle register determines whether the associated EVENt bit influen-
ces the summary bit (see below). Each bit of the EVENt register is ANDed
(symbol '&') with the associated ENABle bit. The events of all logical opera-
tions of this register are ORed (symbol '+') and passed on to the summary
bit.
ENABle bit = 0: the associated EVENt bit does not affect the summary bit. bit
= 1: if the associated EVENT bit is "1", the summary bit is also set to "1".
This register can be written to and read as required. Reading the register
does not change its contents.
Summary bit
As stated above, the summary bit for each register is derived from the
EVENt and ENABle registers. The result is entered into a bit of the CONDi-
tion register of the next higher register. The device automatically generates
the summary bit for each register. An event may thus cause a service
request through all hierarchical levels.
The Service Request Enable register (SRE) defined by IEEE488.2 can be viewed as
the ENABle register of the STB. Accordingly, the ESE can be viewed as the ENABle
register of the ESR.
STATus
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