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Programming the GPIB-COM
Section Five
Transmitter Holding Register
Offset from Base I/O Address = 0
Register Address = XF8
DLAB bit in Line Control Register = 0
7
6
5
4
3
2
1
0
D7
D6
D5
D4
D2
D1
D0
D3
W
The Transmitter Holding Register contains the character to be sent to the serial output, with bit 0
being the least significant and bit 7 the most significant. It functions identically on the GPIB-COM
and the INS8250.
Bit
Mnemonic
Description
7-0w
D[7-0]
Data Bits 7 through 0
GPIB-COM User Manual
5-2
© National Instruments Corporation
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