JP3306191B2 - Recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus having a plurality of channels, and more particularly to a recording apparatus which compares a preset upper limit value and a lower limit value with a recording signal of each channel. It is related to the improvement of

[0002]

2. Description of the Related Art A conventional apparatus of this kind will be described with reference to FIGS. 1, 2 and 3. FIG. Although FIG. 1 also shows the apparatus of the embodiment of the present invention, the conventional part thereof will be described here. The recording apparatus of FIG. 1 has four channel configurations indicated by reference numerals 1 to 4. Each channel configuration of the conventional device has the same configuration. As shown in FIG. 2, for example, the first channel has an A / D converter 101 for converting a recording signal to be recorded into a digital value, and a CPU.
4 as a digital signal. The control circuit 4 calculates the digital signal to be measured of each channel and simultaneously sends recording data for each channel to the head driving circuit 8 in accordance with the recording timing. The head drive circuit 8 outputs recording data to the thermal head 9 and prints and records a desired recording waveform or the like on the recording paper 6 supported by the platen 5.

In such a recording apparatus, generally, FIG.
There was a recording method as shown in FIG. That is, an upper limit value and a lower limit value of the recording signal are set in advance, and an alarm or the like is issued when the recording signal exceeds the upper limit value or the lower limit value. In such a recording method,
It was necessary to constantly compare the recorded signal with these upper and lower limits. As shown in FIG. 2, a conventional general method of comparing the upper and lower limits includes a digital comparator 10 for an upper limit.
There has been a method of providing a digital comparator 104 for 3 and the lower limit in each channel configuration. The control circuit 4 supplies the upper limit value data to the upper limit value digital comparator 104, and the lower limit value data to the lower limit value digital comparator 105, and activates the switch 102 to send the digital signal to be measured to both digital comparators 104 and 105. Was given.

[0004]

In the above-described recording apparatus, each comparator has one comparator for each channel configuration.
There is the disadvantage that a pair must be provided. For example, a recording device that records 12 signals to be measured had to be provided with 24 comparators, and was often wasted.
This is because, in this type of recording apparatus, it is rare that upper and lower limits are simultaneously compared for all channels. Therefore, the present invention has been made to improve this point, and has as its object to reduce the number of comparators.

[0005]

Therefore, according to the present invention, a recording signal to be recorded has a plurality of channels, and a recording signal of a target channel is compared with a preset upper limit value and a lower limit value. In the recording apparatus configured to perform upper / lower limit comparison using a comparator, one comparator is provided in each of the plurality of channel configurations, and upper / lower limit comparison is performed on a recording signal of any one of the channel configurations. If it is attempted to perform the upper / lower limit comparison, the recording signal of the channel to be subjected to the upper / lower limit comparison is led to the comparator of the own channel and another available comparator to enable the upper / lower limit comparison. The comparator is characterized in that means for selectively connecting the recording signal to the comparator and other empty comparators at a predetermined timing are provided.

[0006]

The recording signal of the channel whose upper / lower limit is to be compared is input to the comparator of its own channel and the comparator of the channel not performing upper / lower limit comparison. By using the comparator of its own channel for the upper limit and the comparator of the other channel for the lower limit, upper and lower limits can be compared.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows an apparatus according to an embodiment of the present invention. A major difference between the apparatus of the embodiment shown in FIG. 1 and the conventional apparatus is that the apparatus has a plurality of paired channel configuration pairs. Each channel configuration of this device is composed of an A / D converter (101 to 4).
..), Switching units (102 to 402,...) And digital comparators (103 to 403,...). And the first and second channels, the third
The channel and the fourth channel,... Form a channel configuration pair. A switching unit 102 for each channel configuration, for example, a first channel and a second channel,
Reference numeral 202 denotes a three-terminal switching element, and each of the digital comparators 1 has its own channel configuration.
03 and 203 are selectively connected to recording signals of the first channel or the second channel.

Now, it is assumed that upper and lower limits are compared for the recording signal of the first channel. The control circuit 4 issues a command to the switching unit 102 of the first channel and the switching unit 202 of the second channel, and connects the connection as shown in the drawing, that is, connects the switching unit 102 of the first channel to the terminal on the left side to record the recording signal of the first channel. To the digital comparator 103 of the first channel and the switching unit 2 of the second channel.
02 is connected to the right terminal, and control is performed such that the recording signal of the first channel is transmitted to the digital comparator 203 of the second channel. Since the upper limit value data is input to the digital comparator 103 of the first channel from the control circuit 4, a signal indicating whether or not the recording signal of the first channel has exceeded the upper limit value is output from the digital comparator 103. 4 is output. On the other hand, since the lower limit data is input from the control circuit 4 to the digital comparator 203 of the second channel,
From the digital comparator 203, a signal indicating whether or not the recording signal of the first channel has exceeded the lower limit is output to the control circuit 4. In these cases, when the digital comparator 103 of the first channel or the digital comparator 203 of the second channel issues “upper limit over output” or “lower limit over output” to the control circuit 4, By reading and recording the recording signal of the first channel stored and held in a memory (not shown), the change from a predetermined time before the recording signal exceeds the upper limit or the lower limit can be recorded. It should be noted that a recording signal relating to a channel which is not involved in the upper / lower limit recording is transmitted to the control circuit 4 irrespective of the digital comparator of the channel, so that the recording operation can be performed even if the normal recording is executed or the recording operation is performed. It may be canceled.

In the above embodiment, when a plurality of channel configuration pairs are provided and the upper and lower limits are compared with respect to the recording signal of one of the channels of each channel configuration pair, the comparator of the channel which is not involved in the upper / lower limit comparison. Is used effectively, but the present invention is not limited to this, and the following configuration may be adopted. That is, one channel is included in each channel configuration of a plurality of channel configurations.
When the comparators are provided and the upper and lower limits are compared with respect to the recording signal of any one of the channels, an empty comparator of another channel may be used together with the comparator of its own channel. One comparator may be provided for each channel configuration as described above, and a comparator independent of each channel configuration may be provided. Upper and lower limit comparison processing is performed on the recording signal of each channel using a comparator of each channel and an independent comparator.

In these methods, when the upper and lower limits of the recording signals of two or more channels are simultaneously compared, the following method can be adopted. That is, the control circuit 4 performs an upper / lower limit comparison process on a time division basis for each recording signal to be compared with the upper / lower limit. For example, in the former device,
Now, it is assumed that upper and lower limits are to be compared for the recording signals of the first channel and the second channel, and the comparator of the third channel is vacant at this time. The control circuit 4 connects the recording signals of the first channel and the second channel to the comparators of the respective channels, supplies respective upper limit data corresponding to the respective comparators, and outputs the third upper limit data at the first timing. The first available comparator on the channel
The recording signal of the channel is connected and the lower limit data is supplied to compare the upper and lower limits of the recording signal of the first channel. At the second timing, the recording signal of the second channel is supplied to the vacant comparator of the third channel. Is supplied, and lower limit value data on the recording signal of the second channel is supplied to perform upper / lower limit comparison on the recording signal of the second channel. By performing the operation at the first timing and the operation at the second timing alternately and at high speed, a sufficient upper / lower limit comparison process can be performed. In this way, by using the comparator of its own channel and another channel or an independent free comparator,
The upper and lower limit comparison operation can be performed simultaneously for a large number of recording signals.

[0011]

As described above, according to the present invention, the upper and lower limits of each signal to be measured are compared using a free comparator of each channel configuration or an independent comparator not belonging to each channel configuration. Therefore, the number of comparators can be greatly reduced as compared with the conventional device, and the cost of the device can be reduced overall.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a recording apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a conventional recording apparatus.

FIG. 3 is a recording example diagram when upper and lower limits are compared.

[Explanation of symbols]

 102-402: Switching section 103-403: Digital comparator in channel configuration 4: Control circuit

Claims (1)

(57) [Claims] An apparatus has a plurality of recording signals to be recorded, and uses a comparator to compare a recording signal of a target channel with a preset upper limit value and lower limit value (hereinafter referred to as upper / lower limit comparison). When one comparator is provided in each of the plurality of channel configurations and an upper / lower limit comparison is to be performed for a recording signal of any one of the channel configurations, the upper / lower limit comparison should be performed. In order to conduct the recording signal of the channel to the comparator of the own channel and the other available comparator, and to enable the upper / lower limit comparison, the comparator of the own channel and the other available comparator are predetermined. Recording means for selectively connecting said recording signals at the respective timings.