Citizen CLP-8301 User Manual download pdf (Page 68)

Chapter 8 Maintenance

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DTR protocol

DTR signal “Ready (High)” level requirements:

The following must be satisfied:

· Printer is on line.

· Receive buffer has more than 128 bytes available.

Note: When receive buffer has less than 128 bytes available, DTR signal becomes “Busy

(Low)” level and this “Busy (Low) level is kept until receive buffer has at least 1K bytes

available.

DTR signal “Busy (Low)” level requirements:

The following must be satisfied:

· Printer is in error.

· Printer is in paused state.

· Receive buffer has less than 128 bytes available.

Pin assignment

Pin No. Signal Input/Output Description

1 FG Output Frame ground

7 SGND Output Signal ground

2 TXD Output Signal to transmit data

3 RXD Input Signal to receive data

4 RTS Output

Transmission request signal. Pull up to +12V with

3.3Kohm

6 DSR Input

Signal active when host computer ready to interface with

printer

20 DTR Output

Signal active when printer ready to interface with host

computer

25 VCC Output (Factory use)

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 74 75

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Citizen CLP-8301 User Manual Page 68