Citizen CLP-8301 User Manual page 68

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
1 FG
7 SGND
2 TXD
3 RXD
4 RTS
6 DSR
20 DTR
25 VCC
Input/Output
Output Frame ground
Output Signal ground
Output Signal to transmit data
Input Signal to receive data
Transmission request signal. Pull up to +12V with
Output
3.3Kohm
Signal active when host computer ready to interface with
Input
printer
Signal active when printer ready to interface with host
Output
computer
Output (Factory use)
- 59 -
Chapter 8 Maintenance
Description