Star Micronics CBM-820 ESC u n, will send only 1 byte without confirming the DSR signal status

ESC u n

[Function]	Sends Peripheral Device Status
[Code]	ASCII	ESC	u	n
	Hexadecimal	1B	75	n
	Decimal	27	117	n
[Range]	n = 0, 48

[Outline]	This command sends the status of the connector pin n every time the command is executed.
	The following lists the type of n.
		n		Connector Pin
		0, 48		Drawer kick connector No. 3 pin
[Caution]	The following table describes the status sent.
	•	If nothing is connected to the connector, the bit 0 will be always "1".
	•	If DTR/DSR control is selected and the memory switch 4-5 is set to 0, the printer sends only 1
		byte after confirming that the host is ready to receive (the DSR signal status is Space).
		If the host is not ready (the DSR signal status is Mark), the printer will wait until it will be ready
		to receive. If XON/XOFF control is selected or the memory switch 4-5 is set to 1, the printer
		will send only 1 byte without confirming the DSR signal status.
	•	Since this command is executed at deployment of the reception buffer, there may be a delay
		between command reception and status sending, depending on the reception buffer
		condition.
	•	If ASB is enabled by GS a, it is necessary to distinguish the status by this command from that
		of ASB. See “6. Interface” for how to distinguish them.
	•	If n goes beyond the range, this command will be ignored.
		Bit		Peripheral Device	Hexadecimal	Decimal
		0		No. 3 pin’s level = L	00	0
				No. 3 pin’s level = H	01	1
		1		Undefined	–	–
		2		Undefined	–	–
		3		Undefined	–	–
		4		Unused	00	0
		5		Undefined	–	–
		6		Undefined	–	–
		7		Unused	00	0
[See Also]	DLE EOT,		GS a, 6. Interface, 7. Peripheral Unit Driver Circuit

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