National Instruments GPIB-MAC User Manual page 103

November 1985
The power-on default is that XON/XOPP for both cases
is disabled.
If you call xon without an argument, the GPIB-MAC
returns to you the current settings. (l=protocol enabled,
O=protocol disabled)
Examples:
1. PRINT #l,"XON 1,l"
2. PRINT #l,"XON 0,l"
3. PRINT #l,"XON"
response:
4. PRINT #l, "XON ,O"
92 SECTIONFOUR-FUNCTIONS
'Enable GPIB-MAC XON/XOPP
'protocol for TX and RX.
'Disable protocol on TX;
'enable protocol on RX
Return current settings.
(transmit protocol disabled,
receive protocol enabled)
'Disable protocal on RX, keep
'current setting on TX.