Programmer's Guide
PcOS Series 90PLUS
Communications
Serial Port
11/07/05
Rev Q
Page 137
8.3
Serial Port
8.3.1
Serial Port Features
The serial port features are as follows:
Baud rates
300, 600, 1200, 2400, 4800, 9600, 19.2 K
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
Table 22 Serial bit rates
It should be noted that the 7-bit no parity is in fact an 8-bit format. The implementation of the hardware
UART in the Intel 8051 family will not implement a true 7-bit no parity format. If the host provides a true
7-bit no parity format, it must be configured with two stop bits.
The Series 90PLUS Printer has a 64-character high-speed buffer before the main system buffer. This high-
speed buffer allows the printer to operate at high serial data rates while printing. Because no data is
evaluated in this buffer, the printer will have a delayed response to inquire requests and [CR]’s during one-
line operation. This has a significant effect on one-line mode operation.
8.3.2
Serial Port Pin out
Not connected
Input
Pin 1 DCD Data carrier detect
Not used
Used in printer
Input
Pin 2 RX
Receive data
Commands/data to print
Output to host
Output Pin 3 TX
Transmit data
Return data
Ready and/or flow
control signal to host
Output Pin 4 DTR
Data terminal ready Printer ready to receive data
(follows buffer)
Pin 5 GND Signal ground
Disable printer
control from host
Input
Pin 6 DSR Data set ready
Not used in standard printer
(configurable)
Ready and/or flow
control signal to host
Output Pin 7 RTS
Request to send
Printer ready to receive data
(follows buffer)
Flow control from
host
Input
Pin 8 CTS
Clear to send
Not used in standard printer
(configurable)
Strapable 12 V or
DTR
Output Pin 9 SSD
Secondary data
Not used in standard printer
(provides power to peripheral)
Table 23 Serial port pin out
Because both the host and the printer are data terminal equipment (DTEs), they use the same serial port pin
outs. If the cable used to connect the host to the printer is a pin-to-pin interconnect, it will not work. For this
reason, a null modem or turn around cable must be used to interconnect the host and the printer.
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