Measurement Computing Serial488/4 - Manual (Page 53)

Section 3 Command Descriptions
3.14
Handshake Control Nn
The Handshake Control, in conjunction w ith the Handshake Type command,
determines what flow control method is to be used in serial data transfers for the
selected port. The Port Select command (
Pn
) is used to select the serial port
regardless of addressing mode in use. If the hardw are handshake method ( G0) is
being used, the handshake control command w ill effect the serial port's RTS line.
Handshaking control may be selected to asserted
and un-asserted the RTS line
automatically as memory is available, asserted the
RTS
line continually or un-
asserted RTS line continually.
When the softw are handshake method ( G0) is used, the handshake control
command will effect the sending of the handshake characters
XON
and XOFF.
Handshaking control may be selected to enable the automatic output of XON/XOFF
serial characters as memory dictates, cause the XOFF character to be issued, or cause
the XON character to be issued. Additionally this command may be used to enable
the output of sixteen times the baud rate clock on the RTS line.
If the no handshake method ( G2) is in use, the H andshake Control command
controls the assertion, un-assertion, or output of a signal sixteen times baud clock
output on the RTS line.
The factory default setting as set by the Save Configuration command (
S0
) is
N0
, automatic handshaking.
N0
Automatic handshaking, RTS/CTS or XON/XOFF.
N1 Hold off serial input, un-assert RTS or send XOFF.
N2
Release holdoff of serial input, assert RTS, or send XON.
N3
Automatic XON/XOFF handshake with 16 x baud clock output on RTS
line, or no handshaking and 16 x baud clock output on RTS line.
N?
Return present handshaking control selection.