2 – 20
Remote Operation
This register is cleared at power-on.
2.5.5
Communication Error Status (CESR)
The Communication Error Status register consists of 8 event flags;
each of which is set by the corresponding event, and cleared only by
reading or with the
*CLS
command. Reading a single bit (with the
CESR?
i
query) clears only bit
i
.
Weight
Bit
Flag
1
0
PARITY
2
1
FRAME
4
2
NOISE
8
3
HWOVRN
16
4
OVR
32
5
RTSH
64
6
CTSH
128
7
DCAS
PARITY : Parity Error. Set by serial parity mismatch on incoming data
byte.
FRAME : Framing Error. Set when an incoming serial data byte is missing
the STOP bit.
NOISE : Noise Error. Set when an incoming serial data byte does not
present a steady logic level during each asynchronous bit-
period window.
HWOVRN : Hardware Overrun. Set when an incoming serial data byte is
lost due to internal processor latency. Causes the Input Bu
ff
er
to be flushed, and resets the command parser.
OVR : Input Bu
ff
er Overrun. Set when the Input Bu
ff
er is overrun
by incoming data. Causes the Input Bu
ff
er to be flushed, and
resets the command parser.
RTSH : Undefined for the SIM980. Command Error. Indicates a parser-
detected error.
CTSH : Undefined for the SIM980.
DCAS : Device Clear. Indicates the SIM980 received the Device Clear
signal (an RS-232
h
break
i
). Clears the Input Bu
ff
er and Output
Queue, and resets the command parser.
2.5.6
Communication Error Status Enable (CESE)
The CESE acts as a bitwise AND with the CESR register to produce
the single bit CESB message in the Status Byte Register (SB). It can
be set and queried with the
CESE(?)
command.
SIM980
Analog Summing Amplifier