Unit 3: Interface Secifications
RS232C SERIAL INTERFACE
This interface is an industry standard for serially transmitting data using a wired cable. Separate transmit and receive lines enable data to flow in both directions simultaneously. Data transmitted using this protocol is defined in its parameters; baud/bps (speed), data bits, stop bit, parity, and
Default Parameters:
Figure 3-1, RS232 Male Connector Pin Assignments
Figure 3-2, RS232 Female Connector Pin Assignments
READY/BUSY CABLE REQUIREMENTS
DB9 | DB25 | HOST | DIRECTION |
| PRINTER |
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2 | 3 | RD (Receive Data) | To Host | 1 | TD (Transmit Data) |
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3 | 2 | TD (Transmit Data) | To Printer | 6 | RD (Receive Data) |
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8 | 5 | CTS (Clear To Send) | To Printer | 2 | RTS (Request To Send) |
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5 | 7 | SG (Signal Ground) | 7 | SG (Signal Ground) | |
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7 | 4 | RTS (Request To Send) | To Host | 5 | CTS (Clear To Send) |
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| RS232C SPECIFICATIONS | |
Asynchronous ASCII |
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Data Transmission Rate |
| 9600, 19200, 38400, 57600, 115200 bps |
Data Length |
| 8 bit (selectable) |
Stop Bit |
| 1 bit (fixed) |
Parity Bit |
| ODD, EVEN, NONE (selectable) |
Codes Used |
| ASC II Character Codes |
Control Codes |
| STX (02h), ETX (03h), ACK (06h), NAK (15h) |
Connector |
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Cable |
| Call 704.644.1650 |
Signal Levels |
| High: +12V, |
SATO MB2i Service Manual | PN 9001145B | Page |