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5-10
Pin
number
11
20
Description
Reverse Channel
This signal is used instead of the DTR signal in the RC
protocol. Spaces are sent when the printer is ready to receive
or transmit data.
Data Terminal Ready
Spaces are sent when the printer is on and ready to receive or
transmit data.
Direction
Output
Output
Designation
RC
DTR
Table 5.2 Serial interface signals (continued)
Notes:
1. The space state corresponds to the high level of the interface signal.
2. The direction (output or input) refers to the printer.
5.3.3 Serial data format
The serial data format -- 10 or 11 bits long -- consists of a start bit, data bits, a parity bit, and stop bits. A bit is
in the mark state when not in transmission. Data bits start with the least significant bit (LSB). The character K
(hexadecimal 4B), for example, is transmitted as shown below (7 data bits, even parity).
Figure 5.9 Serial data format
Start
bit
Parity
bit
Stop
bit(s)
Data bits
High, +, or Space
Low, –, or Mark
00000
11 1 1
356
12 4 7
1 (1)