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Signal Name Direction Function
1
FG
–
Frame ground
2
TXD
Output
Data transmission
3
RXD
Input
Data reception
4
RTS
Output
Same as DTR (20pin)
6
DSR
Input
Host reception enabled status HIGH-READY/LOW-NOT READY
[During DTR/RTS control]
The printer transmits data after it is confirmed that DSR is high.
(But transmission by DLE EOT, GS a)
[During XON/XOFF control]
Printer does not confirm DSR.
7
SG
–
Signal ground
20
DTR
Output
Printer READY/BUSY status HIGH-READY/LOW-BUSY
[During DTR/RTS control]
When the printer is in reception enabled status, it is READY, when it is
reception disabled, it is BUSY.
Printer status
1) BUSY until completion of initial settings when the power is turned on
2) BUSY in normal OFFLINE status
3) BUSY in OFFLINE status during PE
4) BUSY in OFFLINE status when other errors occur
5) BUSY when the reception buffer is full
6) BUSY during Self-Print
[During XON/XOFF control]
Always HIGH-READY except under the following conditions
1) Until completion of initial settings when the power is turned on
2) During Self-Print
25
INIT
Input
Printer RESET (1ms or more is higher)
1 DCD
PIN No. Signal Name
1
FG
2
TXD
3
RXD
4
RTS
6
DSR
PIN No. Signal Name
1
2
3
4
6
Chapter5
Chapter5
Chapter5
Chapter5
Appendixes
Interface
Interface
Interface
Interface
Serial (RS232C) interface
Serial (RS232C) interface
Serial (RS232C) interface
Serial (RS232C) interface
Pin assignment
Pin assignment
Pin assignment
Pin assignment
Buffer Full Control
Buffer Full Control
Buffer Full Control
Buffer Full Control
Connection with HOST
Connection with HOST
Connection with HOST
Connection with HOST
39
39
39
39
Reception buffer 40/4K
8/1536 bytes
16/512 bytes
XON
XOFF
Overrun/Buffer size: 16/512 bytes
XOFF cancel size: 8/1536 bytes
Printer D-Sub25P
Host D-Sub9P