Star Micronics SP300 Series - Interface Circuit; RS-232 C Serial Interface; Current Loop (Option)

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2-2. Interface Circuit
2-2-1.RS-232C Serial Interface
Input (RXD, CTS)
Output (DTR, FAULT, TXD, RCH, RTS)
Fig . 2-1 RS-232C interface circuit
2-2-2.Current Loop (option)
Input (TTY-RXD, TTY-RXDR)
Output (TTY-TXD, TTY-TXDR)
Note: Adjust “R” so that the loop current is set within 10 to 20 mA.
Fig. 2-2 Current loop interface circuit
Printer Host computer
75189 or equivalent
+V
Host computer
R
Printer
+V
Host computer
R
Printer
75188 or equivalent
Printer Host computer