Combination Of Handshaking Methods - YOKOGAWA WT3001E User Manual

2.3

Combination of Handshaking Methods

Handshake format Descriptions→
Handshake
Method
The menu of
this instrument
O F F - O F F N O - N O
X O N - X O N X O N - X O N
X O N - R S X O N - R T S
C S - R S C T S - R T S
OFF-OFF
XON-XON
IM WT3001E-17EN
When using the RS-232 interface for transferring data, it is necessary for equipment on
both sides to agree on a set of rules to ensure the proper transfer of data. The set of
rules is called handshaking. Because there are various handshaking methods that can
be used between this instrument and the PC, one must make sure that the same method
is chosen by both this instrument and the PC.
You can choose any of the four methods in the table below.
Data Sending Control (control
method when sending data to a computer)
Hardware
Software
Handshake Handshake
Sending stops Sending stops
when X-off is when CB(CTS)
is False, and
received, and
sending is sending is
resumed when resumed when
X-on is CB is True.
received.
Data Transmission Control
There is no handshaking between this instrument and the PC. The "X-OFF" and "X-ON"
signals are treated as data, and the CS signal is ignored.
Data Reception Control
There is no handshaking between this instrument and the PC. When the received buffer
becomes full, all overflow data are discarded.
RS = True (fixed).
Data Transmission Control
Software handshaking is performed between this instrument and the PC. When an
"X-OFF" code is received while sending data to the PC, this instrument stops the data
transmission. When this instrument receives the next "X-ON" code, this instrument
resumes the data transmission. The CS signal received from the PC is ignored.
Data Reception Control
Software handshaking is performed between this instrument and the PC. When the free
area of the receive buffer decreases to 64 bytes, this instrument sends an "X-OFF" code.
When the free area increases to 192 bytes, it sends an "X-ON" code.
RS = True (fixed).
Data Receiving Control (control
method when receiving data from a computer)
Software
Handshake
No
X-off is sent when
handshake
received data buffer
becomes 3/4-full,
and X-on is sent
when the received
data buffer is only
1/4-full.
Hardware
Handshake
No
CA (RTS) is set to
handshake
False when
received data buffer
is only 3/4-full, and
is set to True when
received data buffer
is only 1/4-full.
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App
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