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4.3- RS-232 SERIAL INTERFACE
4.3.1- RS-232 Serial interface specifications
• Data transmission type:
• Synchronization:
• Flow control:
• Signal levels (RS232):
• Speed:
• Data length:
• Parity:
• Stop bits:
• Connector (user side):
Speed and parity depend on the settings (refer to section 4.6.2).
NOTE:
4.3.2- Change between online and offline mode
The printer is in offline mode:
1) When powering up or resetting the printer, until the printer is ready to receive data.
2) When the platen is opened.
3) After pressing the button while the paper advances.
4) When 'out of paper' causes the printer to stop printing.
5) When the power supply has a temporal abnormal voltage change.
6) When an error has occurred.
4.3.3- Serial RS-232 interface pins assignment
The assignments of the terminals of the RS-232 connector and the functions of its signals are
described in the following table:
Pin
Signal
Number
name
20
TXD
21
RXD
22
RTS
23 / 24
SG
19
DTR
Other
nc
(*1) Definition of 'data receiving buffer full': the state of the printer becomes 'buffer full' when the
receiving buffer increases to 10 Kbytes maximum.
Note: The printer ignores the received data when the free space in the receiving buffer is 0 bytes.
Pin #1
Pin #2
Signal direction
Function
(from the printer
point of view)
Output
Data transmission line.
Input
Data reception line.
Output
This signal indicates whether the printer is busy.
SPACE indicates that the printer is ready to receive
data, and MARK indicates that the printer is busy.
-
Signal ground.
Output
This signal indicates whether an error occurs.
---
Not connected
Table 1. - Pins Assignments of RS-232 connector terminals
Fig. 8. - Serial RS-232 interface pins
EPC1200 SERIES OPERATION MANUAL
Serial
Asynchronous
DTR/DSR control, none for PTR2
MARK = -3 to -15 V
SPACE = +3 to +15 V Logic '0'/ON
9600, 19200, 38400, 115200 bps (bps: bits per second)
8 bits
none, even, odd
Fixed to 1
JST PHDR-24VS (housing)
JST SPHD-001T-P0.5 (terminal) or similar.
Logic '1'/OFF
Pin #23
Pin #24
13/58
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