Printing system and printer with setting switch

1. A printing system including a host device and a printer interconnected by a network, wherein the host device transmits a query on the network to inquire whether devices connected to the network can receive and store printer setting information, then sends printer setting information to the printer if the printer replies to the query, and the printer comprises:

a memory for storing the printer setting information;

a setting switch that is set, in advance, to determine whether the printer setting information stored in the memory can be changed;

a decision unit for deciding, according to the setting of the setting switch, whether a response to the query received from the host device is necessary;

a response unit for responding to the query received from the host device if the decision unit decides that a response is necessary; and

a setting information writer for writing the printer setting information received from the host device in the memory,

wherein the printer further comprises a timing unit for measuring a time interval of a predetermined length from when the setting switch is set to allow the printer setting information received from the host device to be written into the memory, and

wherein the decision unit uses said time interval to decide whether the response to the query received from the host device is necessary.

2. The printing system of claim 1 , wherein the decision unit decides that the response is necessary if the query is received within said time interval.

3. The printing system of claim 1 , wherein the printer further comprises a gate for inhibiting writing of the printer setting information in the memory if the printer setting information is received after expiration of said time interval.

4. A printing system including a host device and a printer interconnected by a network, wherein the host device transmits a query on the network to inquire whether devices connected to the network can receive and store printer setting information, then sends printer setting information to the printer if the printer replies to the query, and the printer comprises:

a memory for storing the printer setting information;

a setting switch that is set, in advance, to determine whether the printer setting information stored in the memory can be changed;

a decision unit for deciding, according to the setting of the setting switch, whether a response to the query received from the host device is necessary;

a response unit for responding to the query received from the host device if the decision unit decides that a response is necessary;

a setting information writer for writing the printer setting information received from the host device in the memory;

a timing unit for measuring a time interval of a predetermined length from when the setting switch is set to allow the printer setting information received from the host device to be written into the memory; and

a gate for inhibiting writing of the printer setting information in the memory if the printer setting information is received after expiration of said time interval.

5. A printing system including a host device and a printer interconnected by a network, wherein the host device transmits a query on the network to inquire whether devices connected to the network can receive and store printer setting information, then sends printer setting information to the printer if the printer replies to the query, and the printer comprises:

a memory for storing the printer setting information;

a setting switch that is set, in advance, to determine whether the printer setting information stored in the memory can be changed;

a decision unit for deciding, according to the setting of the setting switch, whether a response to the query received from the host device is necessary;

a response unit for responding to the query received from the host device if the decision unit decides that a response is necessary;

a setting information writer for writing the printer setting information received from the host device in the memory;

an address register for retaining a first address identifying the host device to which the response unit responded;

an address comparator for comparing a second address identifying the host device from which said printer setting information is received with the first address retained in the address register; and

a gate for inhibiting writing of the printer setting information in the memory if the second address does not match the first address.

6. A printer connected to a network, the printer comprising:

a memory for storing the printer setting information;

an input unit for input of changing information for changing the printer setting information stored in the memory, said input of changing information for changing the printer setting information being independent of each of data to be printed;

a setting switch for input of a setting, said setting switch being set in advance either to allow the printer setting information stored in the memory to be changed by said changing information or to prevent the printer setting information stored in the memory from being charged by said changing information;

a control unit for performing control, according to the setting of the setting switch, as to whether to change the printer setting information stored in the memory according to the changing information for changing the printer setting information received by the input unit.

7. The printer of claim 6 , wherein the input unit includes a control panel for manual input by an operator of the printer.

8. The printer of claim 6 , wherein the input unit includes a communication unit communicating with a host device connected to the network.

9. A printer connected to a network, the printer comprising:

a memory for storing the printer setting information;

a setting switch that is set, in advance, to determine whether the printer setting information stored in the memory can be changed;

an input unit for input of information for changing the printer setting information stored in the memory, the input unit including a communication unit that communicates with a host device connected to a network; and

a decision unit for deciding, according to the setting of the setting switch, whether to change the printer setting information stored in the memory when the input unit receives the information for changing the printer setting information,

wherein the host device broadcasts a query inquiring whether new printer setting information can be accepted, and

wherein the printer further comprises

a response unit for responding to the query received from the host device if the decision unit decides to change the printer setting information stored in the memory; and

a setting information writer for changing the printer setting information in the memory according to the new printer setting information, which is received from the host device.

10. The printer of claim 9 , further comprising:

a timing unit for measuring a time interval of a predetermined length from when the setting switch is set to allow the printer setting information received from the host device to be written into the memory; and

a gate for inhibiting writing of the new printer setting information in the memory if the printer setting information is received after expiration of said time interval.

11. The printer of claim 9 , further comprising:

an address register for retaining a first address identifying the host device to which the response unit responded;

an address comparator for comparing a second address identifying the host device from which said printer setting information is received with the first address retained in the address register; and

a gate for inhibiting writing of the printer setting information in the memory if the second address does not match the first address.

12. A printer connected to a network, the printer comprising: a memory for storing the printer setting information; a setting switch that is set, in advance, to determine whether the printer setting information stored in the memory can be changed; an input unit for input of information for changing the printer setting information stored in the memory, a decision unit for deciding, according to the setting of the setting switch, whether to change the printer setting information stored in the memory when the input unit receives the information for changing the printer setting information; and

a timing unit for measuring a time interval of a predetermined length from when the setting switch is set to allow the printer setting information received from the host device to be written into the memory, wherein the decision unit uses said time interval to decide whether the response to the query received from the host device is necessary.

13. The printer of claim 12 , wherein the decision unit decides that the response is necessary if the query is received within said time interval.

14. The printer of claim 12 , further comprising a gate for inhibiting writing of the printer setting information in the memory if the printer setting information is received after expiration of said time interval.