Star Micronics TSP200 Manual

A SERVICE OF

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PRINCIPLES OF OPERATION

RXD

TXD

DSR

DTR

RTS

FAULT

INIT

CN6

IC10

ADM232LJR

Dipswitch 2-4

IC1 CPU

Dipswitch 2-3

RXD 0

TXD 0

P93

P91

P94

Comparator

TTL

232C

TTL

232C

Comparator

2. Interface

2-1. Interface Types

2-1-1. RS232 interface

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.