YOKOGAWA wt1600, User Manual

Page: 17 / 162

Overview of the Serial Interface
2-5
IM 760101-11E
2
2.4 Handshaking
To use an serial interface for transferring data between this instrument and a computer, it
is necessary to use certain procedures by mutual agreement to ensure the proper
transfer of data. These procedures are called “handshaking.” Various handshaking
systems are available depending on the computer to be used; the same handshaking
system must be used for both the computer and this instrument.
This instrument allows you to choose any handshaking mode from the following four
modes.
Data Sending Control (control
method when sending data to a computer)
Data Receiving Control (control
method when receiving data from a computer)
Software
Handshake
Software
Handshake
Handshake format Descriptions
→
N O - N O
X O N - X O N
X O N - R T S
C T S - R T S
Handshake
Method
Sending stops
when X-off is
received, and
sending is
resumed
when X-on is
received. Sending stops
when CB(CTS) is
False, and
sending is
resumed when CB
is True. No
handshake
No
handshake
X-off is sent
when received
data buffer
becomes 3/4-
full, and X-on is
sent when the
received data
buffer is only
1/4-full. CA (RTS) is set to
False when
received data buffer
is only 3/4-full, and
is set to True when
received data buffer
is only 1/4-full.
Hardware
Handshake
Hardware
Handshake
O F F - O F F
X O N - X O N
X O N - R S
C S - R S
The menu of
this instrument
1 OFF-OFF
• Transmission data control
There is no handshake status between the instrument and host computer. The X-OFF
and X-ON signal from the host computer is processed as data, and the CS signal is
ignored.
• Reception data control
There is no handshake status between the recorder and host computer. When the
recorder reception buffer becomes full, the excess data is discarded. RS = True (fixed)
2 XON-XON
• Transmission data control
A software handshake status is established between the instrument and host
computer. The instrument will stop a data transmission when an X-OFF signal is
received from the host computer, and will resume transmission when the next X-ON
signal is received. A CS signal from the host computer is ignored.
• Reception data control
A software handshake status is established between the instrument and host
computer. When the intstruments reception buffer vacancy reaches 64bytes, the X-
OFF signal will be sent to the host computer. When the reception buffer vacancy
reaches 192 bytes, the X-ON signal will be sent. RS = True (fixed)