JPS6123444A - Communication system of picture recorder - Google Patents

Abstract

PURPOSE:To eliminate the need for an interface at each adaptor by connecting a main body and plural adaptors with two common serial lines for transmission and reception, and allowing the adaptor receiving the data from the main body in time division to return a signal until the reception is finished. CONSTITUTION:The picture recorder main body A and plural adaptors B1, B2... are connected by a return common serial line C and a reception common serial line D. A data by a time division communication system is supplied to the lines C, D and a serial data at each block is transmitted from the main body A to the adaptors B1, B2... via the line C. Each adaptor receives the data addressed to itself and a return data is transmitted from the adaptors B1, B2... to the main body A via the line D until the reception is finished. Thus, a control board of the main body 1 and an interface at each adaptor are not required, and the constitution is simplified and made inexpensive.

Description

[Detailed Description of the Invention] Children's Presentation (2) ■ Friendship Group The present invention relates to communication control in image recording devices such as copying machines and facsimiles that selectively connect and use some types of additional devices. It is related to the method.

Among the image recording devices, for example, in a copying machine, the additional devices are an automatic document feeder (S A D H), a copy paper collation device (sorter), and a character display device (α/N display). , non-volatile memory data output device for copier control (
There are such things as mini printers).

Of these, devices such as the 5ADH and sorter transmit information about the status of the device, such as whether it is normal or whether there is a problem such as a jam, to the copier main body, and are used to control the entire copying operation. It needs to be data.

Therefore, some additional devices have conventionally had a signal line for outputting response data to the main body, and the main body has been provided with an input interface exclusively for the additional device.

■Problem to be solved:Therefore, there are many types of additional devices that require the transmission of response data, and in order for the user to be able to select and use any additional device according to his/her wishes, , the main body side must be provided with input interfaces corresponding to the number of additional devices, which increases costs and is uneconomical.

Furthermore, when multiple types of additional devices are connected, the signal lines become more audible, leading to poor reliability.

The present invention is intended to eliminate such drawbacks, and aims to transmit response data from a plurality of additional devices on a single common signal line in a time-division manner.

FIG. 1 is a diagram corresponding to the claims of the present invention, and the present invention will be explained in detail according to the same figure.

In an image recording device to which a plurality of additional devices can be connected, an image recording device main body A and a plurality of additional devices BI.

B! , --- are connected by a common serial line C for transmission and a common serial line D for reception.

Two common serial lines C and D carry data based on the time-sharing communication system, and are connected from the main unit A to each additional device B+.
, Bz, -, the additional bag N
It performs communication control to return response data from Br and Bz- to main unit A.

An embodiment of the present invention illustrated in FIGS. 2 to 6 will be described below.

In this embodiment, an automatic document feeder (SADH), a copy paper collating device (sorter), a character display device, etc. are connected to a copying machine.

Here, the 5ADH and sorter need to send response data to the copying machine main body.

The data carried on the common serial line for transmission and reception when viewed from the copying machine main body side is as shown in FIG. 2, with the upper row showing the transmission data and the lower row showing the reception data.

The transmission data is divided into a plurality of blocks in one cycle T, and each additional device corresponds to each block in sequence. Block 1 corresponds to the 5ADH, block 2 corresponds to the sorter, and block 3 corresponds to the character display device. .

=3- The received data is transmitted discontinuously at timings that fit within each block, corresponding to each block of the transmitted data.

In addition, the response data (reception data) after receiving and receiving the transmission data for one additional device is transmitted with a delay of one block, so in Fig. 2, the next data block is sent to 5ADH after the transmission data block 1. Response data 11 from 5ADH is transmitted at a timing corresponding to block 2.

Similarly, response data 12 for transmission data block 2 to the sorter is transmitted at a timing corresponding to block 3.

If we look at block 2 of the transmission data in FIG. 2 in more detail, we will see FIG. 3. In the figure, the transmission data is control address data 21.
The interface data consists of 4 bytes of 22 and 23 block check characters 24, and one byte consists of 11 bits.

Similarly, the response data is control address data 31.
Interface data 32. Consisting of 3 bytes of block check character 33, 1
Few part-time jobs. Similarly, the number of bits in one byte is 11 bits.

Now, the transfer time for one block of transmission data is to,
The transfer time for one block of response data is 1. If the response data transmission delay time is td, then to>t
By setting the delay time td so that the formula d+t holds true, the response data can be contained within one block.

In the case of this embodiment, since the data transfer speed is 48008 PS, 1 byte takes about 2.3 m5ec, and therefore 1 block of data transfer time t
o is 9.2 (-2,3X 4) m5ec, 1 block data transfer time t1 of response data is 6.9 (=
2.3 x 3) m5ec, so the delay time t
It is sufficient to set a time within 2.3 m5ec as d.

By setting in this way, response data from a plurality of additional devices will not be output at the same time and will not conflict.

While referring to Figure 4, further calculate the contents of the response data by −6= explain in detail.

Control address data 31 indicates the address attached to the attached device and the number of data, interface data 32 indicates the content of response data, and block check character 33 is for performing a parity check for each block.

The first bit 35 of each byte is a start bit and is always transmitted as 0, and the trailing bit 40 is a stop bit and is always transmitted as 1. The second bit 36 is a control bit and is always transmitted as 0. The content indicated by indicates whether it is control address data, other interface data, or a block check character; "1" indicates control address data, and "0" indicates other data.

Regarding the control address data 31, the 3 bits 37 following the control bit 6 indicate the address of the attached device. For example, if it is 5ADH, it is "ooo", if it is a sorter, it is "001", etc., and the address is assigned in correspondence with each attached device. is sent.

The 4 bits 38 that follow indicate the number of data transferred in one block in binary, for example "0011
” indicates that 3 bytes of data are included in one block.

Furthermore, the following 1 bit 39 is for performing a parity check for each byte.

Start bit 3 for interface data 32
5. Control bit 36. Vertical parity check 3
9 and 7 bits 41 other than stop bit 4o are written with the response contents of the attached device indicated by address bit 37, and are provided with multiple interface data depending on the needs of the attached device, but are always the interface data in the transmission data. Less than the number of data.

Also for block check character 33, start bit 35. Control bit 36. Seven bits other than parity check 39 and stop bit 4o are bits for parity check.

Afterwards, the copying machine main body side reads the contents of the address bits of the control address data 31. By doing so, it is possible to determine which additional device the response data is from, and the contents of the response can be determined using the next interface data. You can know.

FIG. 5 shows a transmitting/receiving circuit between the main body of the copying machine and the 5ADH.

The communication circuit is the same for both transmission and reception, and to explain the reception line from the 5ADH to the main body side, on the 5ADH side, data is placed on the balanced line 59 in a 20 mA current loop by a line driver 52 consisting of an inverter 50 and a balanced output gate 51. On the main body side, the balanced &1159 is connected to both ends of the light emitting diode 56 of the photocoupler 55 via two resistors 53 and 54 (one end of the resistor 54 is grounded), and the output of the phototransistor 57 is output. is the C of the copying machine main body via the buffer 58.
Input to UP.

As mentioned above, the reason for ensuring reliable transmission by eliminating erroneous signals due to noise as much as possible is that if the contents of address bit 37 of the control address data are incorrect, the response contents of another additional device will be sent. This is because the input signal may become uncontrollable or send an erroneous control signal, possibly causing a malfunction.

Note that the balance line from other additional devices also matches the balance line 59 on the main body side.
connected to.

Here, the data input method on the main body side will be explained with reference to FIG.

The main body side has an internal clock that can sample the median value of the bits of the input data line, and in Figure 6, the data placed on the upper input data line is input to the lower internal clock in response to the data as shown in the figure. do.

Now, if the logical sum of clocks 1 and 2 is "0" and the start bit is detected, the content read by clock 4 will be "1".
If so, it is determined to be control address data, and if it is '0', it is determined to be interface data or block check character.

If it is determined to be control address data, further
At the next clock 6.8.10, take the logical sum of the read contents, and when the sum is "0", it is judged that the data is sent from 5ADH, and when it is "1", it is determined that the data is sent from the sorter. The response data is determined as follows.

In this way, the main unit can read the response data and make decisions. As described above, in this embodiment, even when a plurality of additional devices that require the transmission of response data are connected, only one output interface and one input interface are required on the copying machine main body side, and each balance line has its own one. It is sufficient to connect additional devices in parallel, which is economical and highly reliable.

In addition, even when connecting another additional device, it is only necessary to connect it to the common data line in hardware.
All that is left to do is to add the block for the additional device to the transferred data.

In this embodiment, the transfer speed is set to 48008 PS, but this is not limited, and even higher speeds can be applied.

Furthermore, even if a new additional device is developed, it can be easily connected and used.

As described above, the present invention enables two-way data input/output with multiple groups of additional devices using two serial lines, reduces the cost of the control board and interface, and allows easy connection with additional devices. It is simplified and convenient, and reliability can also be improved.

Furthermore, it is convenient to be able to simply increase the number of additional devices that can be connected.

[Brief explanation of the drawing]

FIG. 1 is a claim correspondence diagram of the present invention, FIGS. 2 and 3 are diagrams showing the timing of transmitted and received data in an embodiment of the present invention, FIG. 4 is a diagram showing the contents of response data, and FIG.
This figure shows the transmitting and receiving circuit of this embodiment, and FIG. 6 is a diagram explaining the input method of input data. 1...5 ADH block, 2... Sorter block, 3... Character display block, 11...5A
DH response data, 12... Sorter response data, 21.
...Control address data, 22.23...Interface data, 24...Block check character, 31...Control address data, 32
...Interface data, 33...Block check character, 35...Start focus, 36...
・Control bit, 37...Address bit, 3
8...Data number bit, 39...Parity check bit, 40...Stop bit, 41...Interface data bit, 50...Inverter, 51...
... Balanced output gate, 52 ... Line driver, 5
3゜54...Resistor, 55...Photocoupler, 56.
...Light emitting diode, 57...Phototransistor,
58...Buffer, 59...Equilibrium line. Agent: Patent attorney Nozomi Ehara and 2 others - 12=

Claims (1)

[Claims] In an image recording device that can selectively connect multiple additional devices and use them under the control of the main unit, the image recording device main body and the multiple additional devices are connected via two common serial lines in two directions: transmission and reception. When connected and transmitting/receiving using the time-division communication method, the main unit receives response data from the additional device from the time the additional device starts receiving one block of data sent to each additional device until the end of reception. A communication control method for an image recording device characterized by sending a reply to the user.