Citizen CT-D150 Command Reference Manual page 508

Device ID
The device ID is a character string that provides the ID, the type, and other information regarding the printer connected to the
interface. When the printer receives a request for a device ID from the host, it replies with the following device ID:
<00>H<2E>H
MFG:CITIZEN；
CMD:ESC/POS；
MDL:CT-S300；(*)
CLS:PRINTER；
*This value differs by model and model name is returned.
The first two bytes of the device ID indicate the length of the entire device ID. For a description of a request for a device ID, refer
to the "Negotiation" section.
When the host receives the device ID string of the length indicated by the first two bytes, it must do so consecutively, without
terminating the process until the entire device ID is received. If the process is terminated halfway, the printer discards the rest of
the string; when the printer receives a new request for the device ID, it sends the device ID beginning from the first character of
the ID. After receiving the ID of the length indicated by the first two bytes, the host must carry out the termination even if the
printer has data to send (Data Available). If the host does not carry out Termination and tries to receive data, the printer sends
the printer status.
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