5.4 Pin Configuration Serial and Parallel Port
Data transmission from the computer to the Printer can be done in two ways, either serial or parallel. The
serial goes through an RS 232 C interface, and the parallel is using a Centronics compatible interface. Both
connectors are of the 25 pin D-sub type.
Pin configuration 25 pin male D-sub contact RS 232 C (serial port):
Pin no. 1 FG Frame Ground
Pin no. 2 Tx Transmit data Output
Pin no. 3 Rx Receive data Input
Pin no. 4 RTS Request to send Output
Pin no. 5 CTS Clear to send Input
Pin no. 6 DSR Data set ready Input
Pin no. 7 GND Signal Ground
Pin no. 8 DCD Data carrier detect Input
Pin no. 9 PU + 12V (Logic high) Output
Pin no. 20 DTR Data terminal ready Output
The Printer is only using pin no. 4 (RTS) as a control signal. When this is set to logic low (from the
Printer), the computer must stop sending text immediately. Pin no. 2 (Tx) is used to transmit XON/XOFF
control signals to the computer. The text sent to the Printer is received through pin no. 3 (Rx). All other
outputs from the Printer are set to logic high.
Pin configuration 25 pin female D-sub contact (parallel port):
Pin no. 1 Strobe Input Active low
Pin no. 2 Data 0 Input
Pin no. 3 Data 1 Input
Pin no. 4 Data 2 Input
Pin no. 5 Data 3 Input
Pin no. 6 Data 4 Input
Pin no. 7 Data 5 Input
Pin no. 8 Data 6 Input
Pin no. 9 Data 7 Input
Pin no. 10 Acknowledge Output Active low
Pin no. 11 Busy Output
Pin no. 12 Paper out Output
Pin no. 13 Select Output
Pin no. 14 Not in use
Pin no. 15 Error Output
Pin no. 16 Not in use
Pin no. 17 Frame Ground
Pin no. 18 Signal Ground
Pin no. 19 Signal Ground
Pin no. 20 Signal Ground
Pin no. 21 Signal Ground
Pin no. 22 Signal Ground
Pin no. 23 Signal Ground
Pin no. 24 Signal Ground
Pin no. 25 Signal Ground
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