Star Micronics TSP200 technical manual Interface Types

PRINCIPLES OF OPERATION

2.	Interface
2-1.	Interface Types
2-1-1.		RS232 interface
		CN6	IC10	IC1 CPU
		RXD		RXD 0
		TXD		TXD 0
		DSR		P93
		DTR		P91
			ADM232LJR
		RTS	TTL
			232C
		FAULT	TTL	P94
			232C
			Comparator	Dipswitch 2-3

INIT

Comparator

Dipswitch 2-4

Fig. 2-2 Serial Interface

Data flow from host to printer: IC10 receives serial data from the host through RXD, converts the voltage level from RS232C to TTL, and passes the result to the CPU. The CPU converts the serial data to parallel form and stores the result into buffer memory.

Data flow from printer to host: The CPU generates the data, converts it into serial form, then passes it to IC10. IC10 converts the level from TTL to RS232C and outputs the result over the TXD line.

– 13 –