Citizen CT-S300 manual Precautions, When 76543210 Supported Printer

Models: CT-S300

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Precautions

(1)The Negotiation phase is triggered when the IEEE 1284 Active signal sent by the host becomes High.

(2)In Compatibility mode, the time when the negotiation process begins is, as a general rule, after the host sets nStrobe to High and then the printer outputs an nAck pulse.

Once the nStrobe signal is set to High, however, the printer immediately moves into the Negotiation phase when the high state of IEEE 1284 Active is detected, even if the nAck pulse has yet to be output or is being output. In this case, if the printer has returned to Compatibility mode after Termination, no nAck pulse will be output.

(3)Negotiations can be entered from the Busy or Error state of the Compatibility mode. In this case, the printer will not return to the Busy or Error state before the negotiations, but still remains in the printer state just after Termination.

(4)If the host requested a communication mode that is not supported by the printer, it must move into the Termination phase and return to the Compatibility mode.

Table 2.4.1 Definitions of Request Bits in IEEE 1284 Communication Mode

 

 

Bit Values

 

Xflag

 

Bit

Definition

Hex. Code

When

 

In the

(76543210)

 

 

 

 

Supported

 

Printer

 

 

 

 

 

7

Request Extensibility Link

10000000

80H

High

 

Low

6

Request EPP Mode

01000000

40H

High

 

Low

5

Request ECP Mode with RLE

00110000

30H

High

 

Low

4

Request ECP Mode

00010000

10H

High

 

Low

3

Reserved

00001000

08H

High

 

Low

 

Request Device ID: Return Data Using

 

 

 

 

 

 

Nibble Mode Rev Channel Transfer

00000100

04H

High

 

High

2

Byte Mode Rev Channel Transfer

00000101

05H

High

 

High

 

ECP Mode Transfer without RLE

00010100

14H

High

 

Low

 

ECP Mode Transfer with RLE

00110100

34H

High

 

Low

1

Reserved

00000010

02H

High

 

Low

0

Byte Mode Reverse Channel Transfer

00000001

01H

High

 

High

None

Nibble Mode Reverse Channel Transfer

00000000

00H

Low

 

Low

 

Illegal or Contradictory Request

Other than

Other than

 

Low

 

above

above

 

 

 

 

 

 

The printer only supports the Nibble and Byte modes. For a request for any other mode, Xflag is set to Low.

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Page 154
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Citizen CT-S300 manual Precautions, When 76543210 Supported Printer