Specifications
Confidential
EPSON
TITLE
SHEET
REVISION
NO.
SHEET
NEXT
D
TM-U230
Specification
(STANDARD)
13 14
2.1.1.6 Notes on setting DIP switch 1-8 to on
1) The printer mechanism stops but does not become BUSY in the following cases:
• When an error occurs.
• When the printer stops printing due to a paper-end.
• When paper is fed using the FEED button.
2) When handshaking with the printer while using this switch setting, make sure to monitor the
printer with the GS a command and the ASB function.
With this switch setting, the default value of the GS a command n is 2. This automatically
transmits the printer status, depending on online/offline changes.
3) When using the DLE EOT or DLE ENQ command, make sure the receive buffer does not
become full.
• Notes on using a host that cannot transmit data when the printer is BUSY:
If an error occurs when the receive buffer is full and the printer is BUSY, the DLE EOT and
DLE ENQ commands cannot be used.
• Notes on using a host that can transmit data when the printer is BUSY:
If a DLE EOT or DLE ENQ command is used while sending bit-image data, and the receive
buffer-full state is encountered during transmission of the data, the DLE EOT or DLE ENQ
command is processed as bit-image data.
In addition, the data transmitted during the receive buffer-full state may be lost.
Example:
Set the receive buffer to 16KB, and check the status with GS r for each line of printing
transmitted. Make sure the data for printing each line does not cause the printer to enter the
receive buffer-full state.
2.1.1.7 Notes on resetting the printer using the interface
The printer can be reset through the interface (pins 6 or 25) by changing the DIP switch settings
accordingly (Refer to Table 3.3.2).
Table 2.1.3 Switching of the Reset Condition
Pin No. DIP Switch Reset Condition
Pin 6 (DSR) DSW 2-3: ON MARK input
Pin 25 (INIT) DSW 2-4: ON SPACE or TTL-HIGH level voltage signal input
To reset the printer, the conditions given below must be satisfied:
<DC characteristics>
Table 2.1.4 DC Characteristics of the Reset Condition
Item Symbol Pin 6 (DSR) Pin 25 (INIT)
Input HIGH level voltage V
IH
+3 to +15 V +2 to + 15 V
Input LOW level voltage V
IL
-15 to -3 V -15 to + 0.8 V
Input HIGH level current I
IH
5 mA (maximum) 1 mA (maximum)
Input LOW level current I
IL
-5.3 mA (maximum) -2 mA (maximum)
Input impedance R
IN
3 kΩ (minimum)