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Communications modes
The following communications modes are available.
If the instrument continues providing output for more than two to three hours, it will
start delivering signals at an interval approximately one second longer than the preset
interval because of the characteristics of the internal clock.
Communication mode
Description
Normal mode (nor)
Allows operating normal communication functions.
Talk-only mode (tonLY)
Outputs set generation value and measured value at specified interval (0*
to 3,600 sec.).
Printer mode (Print)
Outputs set generation value and measured value at specified interval (0*
to 3,600 sec.) via a printer.
* If 0 is specified for the interval, one data item is output whenever the [HOLD] key is pressed.
Handshaking
To use an RS-232-C interface to transfer data between this instrument and a computer,
it is necessary to use certain procedures by mutual agreement to ensure the transfer of
data. These procedures are called "handshaking."
Various handshaking systems are available depending on the computers to be used; the
same handshaking system must be used for both the computer and this instrument.
There are four handshaking system combinations in this CA100 calibrator.
Data send control
(Control method when sending data to computer)
Data receiving control
(Control method when receiving data from computer)
Software
handshaking
Software
handshaking
Handshaking System Combination (A circle indicates that the function is available.)
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
handshaking
No
handshaking
Hardware
handshaking
Hardware
handshaking
0
1
2
3
Handshake mode selection
number
X-OFF is sent when
the received data
buffer becomes
three quarters full,
and X-on is sent
when the received
data buffer becomes
one quarter full.
CA (RTS) is set to false
when the received buffer
becomes three quarters
full, and is set to true
when the received data
buffer becomes one
quarter full.
Note
• The program for the personal computer must be designed in such a way that the receive buffers of
both this instrument and the personal computer never become full.
Precautions Regarding Data Receiving Control
When handshaking is used to control received data, data may still be sent from the
computer even if the free space in the receive buffer drops below 64 bytes. In this case,
after the received buffer is full, the excess data will be discarded, whether handshaking
is in use or not. Data storage to the buffer will begin again when there is free space in
the buffer.
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