❏
Serial interface specifications
• Input connector (25-pin serial)
RS-232C Pin assignments
Notes:
1. NC stands for no connection.
2. CHASSIS GND and GND are connected in the printer.
• Handshake protocol
One of the following four protocols can be selected:
- DTR protocol (Busy/Ready protocol)
- X ON/X OFF protocol I
- X ON/X OFF protocol II
- ETX/ACK protocol
• Logic level
ON=Space (0)=High:
12V (+3 t15V)
OFF=Mark (1)=LOW:
-12V (-3 through -15V)
• Baud Rate
In the setup options, one of the following baud rates can be selected:
300, 600, 1200, 2400, 4800, 9600, 19200, and 38400 BPS.
13
25
1
14
75188 or equivalent
Output
330pF
Input
Inside printer
75189 or equivalent
Output signal
Input signal
+3 +15V
START D1
D2
D3
D4
D5
D6
D7 D8
STOP
-3 -15V
Data frame
101
A. Specifications
PIN
SIGNAL
IN/OUT
PIN
SIGNAL
IN/OUT
1
CHASSIS GND
14
NC
2
TXD
OUT
15
NC
3
RXD
IN
16
NC
4
RTS
OUT
17
NC
5
CTS
IN
18
NC
6
DSR
IN
19
NC
7
SIGNAL GND
20
DTR
OUT
8
CD
IN
21
NC
9
NC
22
NC
10
NC
23
NC
11
SRTS
OUT
24
NC
12
NC
25
INC
13
NC
