Epson EU-m30 Series, Developer'S Manual

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2) When setting Memory switch 1-3 to ON to enable handshaking with the printer, be sure to check the printer
status using the GS a command and the automatic status back function of the data dependent on that
command.
In this setting, the default value of n for GS a is 2. The printer automatically transmits the printer status
when the online/offline status changes.
3) Be sure that the receive buffer does not become full when using DLE EOT, DLE ENQ, or DLE DC4.
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Notes on using a host computer that cannot transmit data when the printer is busy:
DLE EOT, DLE ENQ, and DLE DC4 cannot be used if an error occurs when the printer is busy due to a
receive buffer-full status.

Notes on using a host computer that can transmit data when the printer is busy:
A DLE EOT, DLE ENQ, or DLE DC4 command used while transmitting bit-image data is processed as
bit-image data if the receive buffer becomes full while transmitting bit-image data.
Data transmitted when the receive buffer is full may be lost.
Example:
Check the printer status using GS r after transmitting each line of data with a 4-KB receive buffer. The
amount of data for one line must not make the receive buffer become full.
(8) Notes on setting Memory switch 1-7 to ON
1) When using #6 pin (DSR) to reset, turn memory switch 1-7 ON.
2) When memory switch 1-7 is turned ON, the printer enters reset status when MARK level is input to #6 pin
(DSR) or connector (terminal) is open.
1.16 Connectors
1.16.1 Interface connector
(1) See Section 1.15. Interfaces.
1.16.2 Power supply connector
(1) Function
This is the connector for the external power supply.
Using PS connector, it is possible to connect optional power supply PS-180, etc.
(2) Pin assignments
Pin number Function
1 +24 V
2 GND
3 N.C
SHELL F.G
(3) Model
Printer side: Hosiden TCS7960-532010 or equivalent
User side: Hosiden TCP8927-631167 or equivalent
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