NCR 7890, User Manual

Page: 144 / 217

Programming Your 7890 Scanner
RS-232 Parameters - 1
User’s Guide 5-69
RS-232 Parameters - 1
The RS-232 Parameters - 1 Programming mode contains
four of the parameters required for RS-232
communications. From this programming mode you
can select the Baud Rate, Parity, Stop Bits And Character
Length, and Handshake Options. Refer to the RS-232
Parameters - 1 worksheet in Appendix A.
The Baud Rate parameter contains seven selections: 300
Baud, 600 Baud, 1200 Baud, 2400 Baud, 4800 Baud,
9600 Baud, and 19200 Baud. Scan the appropriate Hex
0
through Hex 6 tag to set the desired Baud rate. The
default is 9600 Baud.
The Parity parameter contains five selections: Odd,
Even, Mark, Space, and None. For 7-bit characters, bit 8
is the parity bit; for 8-bit characters, bit 9 is the parity
bit. Choosing no parity and 7-bit character length causes
the scanner to send two stop bits; the scanner must also
receive two stop bits. Scan the appropriate Hex 0
through Hex 4 tag to select the desired Parity. The
default is Odd.
The Stop Bits and Character Length parameter contains
four selections: 1 Stop Bit and 7-Bit Character length (0),
1 Stop bit and 8-Bit Character length (1), 2 Stop Bits and
7-Bit Character length (2), and 2 Stop Bits and 8-Bit
Character length (3). Choosing no parity and 7-Bit
Character length causes the scanner to send two stop
bits; the scanner must also receive two stop bits. If you
select 8-Bit Character length and parity, only one stop
bit is sent. Scan the appropriate Hex 0 through Hex 3
Baud Rate
Parity
Stop Bits and
Character Length