Measurement Computing Serial488/4 - Manual (Page 47)

Section 3 Command Descriptions
3.8
Handshake Type Gn
The Handshake Type command determines the flow control method to be used in
serial data transfers for the selected serial port. The Port Select command (Pn) is used
to select the serial port regardless of addressing mode in use.
The hardware handshake method uses the RTS and CTS signals of the serial
interface to prevent data overruns by asserting the RTS line when the Serial488/4 is
able to accept data and requiring the CTS signal to be asserted before transmitting
data.
The software handshake method uses two special serial characters, XON (11 hex)
and XOFF (&H13) to control data flow . T he XOFF character is sent to stop data
transmission and the XON character is sent to resume data transmission. It should be
noted that the software method is not compatible w ith binary data as the data itself
may contain XON and XOFF characters.
If no handshaking is desired, handshaking may be disabled entirely. The factory
default setting as set by the Save Configuration command (S0) is G0, hardware
handshaking (RTS/CTS).
G0
Hardware handshaking (RTS/CTS) is selected.
G1
Software handshaking (XON/XOFF) is selected.
G2
No handshaking is selected.
G?
Return present handshaking method.
Example 1: Select software handshaking on port 1 using dual primary addressing
mode.
PRINT#1,"OUTPUT08;P1X" select port 1 as the current port
PRINT#1,"OUTPUT08;G1X"
select software handshaking
Example 2: Select hardware handshaking on port 2 using secondary addressing mode.
PRINT#1,"OUTPUT0800;P2G0X"
select hardware handshaking for port 2