!
!+1 1!
Serial Port Features
The serial port features are as follows:
Baud Rates
300, 600, 1200, 2400, 4800, 9600, 19.2K, 38.4K, and 57.6K
Bit Patterns
8-bit no parity; 8-bit odd; 8-bit even; 7-bit no parity; 7-bit odd; 7-bit even
Flow Control
DTR and XON/XOFF
Pin 1
Pin 8
Not Connected
Pin 2
Pin 3
RX
Receive Data
Pin 3
Pin 2
TX
Transmit Data
Pin 4
Pin 20
DTR
Data Terminal Ready
Pin 5
Pin 7
GND
Signal Ground
Pin 6
Pin 6
DSR
Data Set Ready
Pin 7
Pin 4
RTS
Request to Send
Pin 8
Pin 5
CTS
Clear to Send
Pin 9
Pin 11
Not Connected
Table 5 Serial Interface Pin-outs
Signal Voltage and Current levels
The serial interface meets EIA RS232 interface specifications:
Voltage Levels
Max
+-15 Volts
Min
+- 3 Volts
Mark = Off =
-3 to –15 Volts
Space = On =
+3 to +15 Volts
Because both the host and printer are DTE's (Data Terminal Equipment), they use the
same serial port pin-outs. If the cable that is used to connect the host to the printer is a
pin-to-pin inter-connect, it will not work. Therefore, a null modem or turn-around cable
must be used to interconnect the host and the printer.
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