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Programming the GPIB-COM Section Five
GPIB-COM User Manual 5-2 © National Instruments Corporation
Transmitter Holding Register
Offset from Base I/O Address = 0
Register Address = XF8
DLAB bit in Line Control Register = 0
7 654 321
0
D6 D5
D7
D4
D3
D2 D1 D0
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