Kyocera FS 3830N FS-3820N/3830N Operation Guide Rev-1.1 - Page 211

RS-232C Protocol SG - Signal Ground - (Pin 7) All signals can transmit between the printer and the host computer to send each signal with a signal ground. DTR - Data Terminal Ready - (Pin 20) This output is used as a buffer nearly-full handshake line. It is held high (above 3 volts) when the buffer can accept more data. RS-232C Interface Voltage Levels The voltage levels of the interface signals conform to EIA RS-232C specifications. SPACE is from 3 volts to 15 volts. MARK is from -3 volts to -15 volts. Voltages between -3 volts and 3 volts are undefined. RS-232C Protocol A protocol is a set of rules the computer follows in sending data to the printer. The RS-232C parameters are stored in battery backed-up memory. They are indicated on the status printout. They can be changed by the FRPO (firmware reprogram) command described in the Programming Manual provided on the CD-ROM supplied with the printer. The parameters and their identification codes are given below. H1: Baud rate Parameter value 12 24 48 96 19 38 57 11 Table B-5 Baud rate 1200 2400 4800 9600 19200 38400 57600 115200 The factory setting is 9600 baud. H2: Data bits 7 or 8, factory-set to 8. H3: Stop bits 1 or 2, factory-set to 1. B-7