Scanlab RTC 5 PC Interface Board, Installation And Operation Manual

Page: 207 / 622

RTC
®
5 PC Interface Board
Rev. 1.9 e
9 Programming Peripheral Interfaces
207
innovators for industry
9.1.6 RS232 Interface
The “RS232” connector provides an RS232 interface
(see
page 51 ). The interface can be configured via
rs232_config . rs232_write_data can be used to
send single data words (bytes) to the RS232
interface. Texts can be sent to the interface via
rs232_write_text or rs232_write_text_list .
9.1.7 McBSP Interface
The McBSP interface at the “SPI / I2C” connector
permanently outputs a 32-bit data word every 10
µ
s
(see page 52 ). The set_mcbsp_out and
set_mcbsp_out_ptr commands (like set_trigger )
allow selection of the signal types to be outputted at
this interface:
• The command set_mcbsp_out lets you specify
two signal types for simultaneous output at the
McBSP-interface. A 16-bit portion of the first
signal type will be packed along with a 16-bit
portion of the second signal type into a 32-bit
data word for output every 10
µ s (for a detailed
description, see
set_mcbsp_out
).
• The command set_mcbsp_out_ptr lets you
define a list of up to 8 signal types. The signals are
outputted sequentially in the specified order. For
every 10
µ s clock cycle, the lower 24 bits of the
corresponding data signal and the associated
signal type number (8 bits) are packed into a 32-
bit data word and outputted at the McBSP
interface (for a detailed description, see
set_mcbsp_out_ptr ).
Notes
• The signals and operating conditions of the
McBSP interface are presented on page 52 .
• In the default setting, the McBSP interface always
outputs bits #4-19 of the cartesian control values
for the X and Y axes (SampleX and SampleY) in a
common 32-bit data word. This is equivalent to
specifying
set_mcbsp_out(7, 8)
.
• Signals specified via set_mcbsp_out or
set_mcbsp_out_ptr will be outputted (possibly
sequentially) until you call one of these two
commands again.
9.2 Signal Input
Signals of peripherals (e.g. signals of a transport
system, workpiece recognition system or process
monitoring camera) can be queried via the interfaces
described below through control commands at any
desired time or – during processing of a list – with list
commands.
9.2.1 16-Bit Digital Input
The EXTENSION 1 connector provides a 16-bit digital
TTL input (DIGITAL IN0 … 15) (see
page 49 ) for
receiving 16-bit digital values. For synchronization of
data transmission, the EXTENSION 1 connector also
provides a SYNC signal.
The read_io_port or read_io_port_buffer and
read_io_port_list commands can be used to read the
current value of the digital input port.
Further commands are provided for conditional
command execution (see
page 213 ).
9.2.2 2-Bit Digital Input
For querying 2-bit digital values, the LASER connector
provides a 2-bit digital input (DIGITAL IN1 and
DIGITAL IN2, see
page 46 ). Its input value can be read
via get_laser_pin_in .
Further commands are provided for conditional
command execution (see
page 213 ).