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Appendix
G
Serial Interface Specifications
Radix provides a very flexible RS232C serial interface. It can
communicate at rates from 150 to 19,200 baud (bits per second)
and supports four different kinds of handshaking. This interface
can also function as a
20mA
current loop interface. The operating
specifications of the interface are as follows:
Data transfer rate: 150-19200
Word length:
1 start bit
7 or 8 data bits
Signal levels:
Odd, even or no parity
1 or 2 stop bits
Mark or logical 1, - 3 to -
15
volts or current
ON
Space or logical 0, + 3 to +
15
volts or current
OFF
Handshaking:
Serial busy, 1 byte mode
Serial busy, 1 block mode
ACK mode
XONlXOFF mode
Note: 19200 baud can be used only with a RS232C interface; it
cannot be used with a 2OmA current loop interface.
Radix has a DB-25 female connector on the back to connect to
a computer. The functions of the pins are summarized in Table
G-1.
Configuring the Serial Interface
DIP switch B controls the configuration of the serial interface.
Switch B is located under Radix's front cover. Table G-2 describes
the functions of the individual switches in DIP switch B.
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