Table 5-3. Word Length Select Bits - National Instruments GPIB-COM User Manual

Section Five
Bit Mnemonic
3r/w PEN
2r/w STB
1-0r/w WL[1-0]
© National Instruments Corporation
Description
Parity Enable Bit
If this bit is set, the INS8250 will generate and check parity
according to the values of the STP and EVEN bits (bits 4 and
5). If this bit is clear, the INS8250 will not generate or check
parity bits.
This bit is ignored by the GPIB-COM.
Stop Bit Control Bit
This bit controls the number of stop bits sent and verified by the
INS8250. If this bit is set, two stop bits will be used. If this bit
is clear, one stop bit will be used.
This bit is ignored by the GPIB-COM.
Word Length Select Bits
These two bits set the length of the words sent or received
according to Table 5-3.

Table 5-3. Word Length Select Bits

Bit 1 Bit 0
0 0
0 1
1 0
1 1
These bits have no meaning on the GPIB and are ignored by the
GPIB-COM circuitry.
5-9
Programming the GPIB-COM
Word Length
5 bits
6 bits
7 bits
8 bits
GPIB-COM User Manual