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Chapter5
Appendixes
Serial (RS232C) interface
Pin assignment
1FG
2 TxD
3 RxD
20 DTR
6 DSR
4 RTS
5 CTS
7SG
25 RESET
1 DCD
3 TxD
2 RxD
4 DTR
6 DSR
7 RTS
8 CTS
5GD
9 RI/RESET
Host D-Sub9P
Reception buffer 40/4K
16/512 bytes8/1536 bytes
XON XOFF
Overrun/Buffer size: 16/512 bytes
XOFF cancel size: 8/1536 bytes
Printer D-Sub25P
Connection with HOST
Buffer Full Control
Interface
PIN No. Signal Name Direction Function
1 Frame ground
2 TXD
FG
SG
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 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)