Scanlab RTC 5 PC Interface Board, Installation And Operation Manual, Page: 49 / 622

RTC
®
5 PC Interface Board
Rev. 1.9 e
4 Layout and Interfaces
49
innovators for industry
4.4.2 EXTENSION 1 Connector
Figure 15 shows the pin-out of the 40-pin
EXTENSION 1 connector.
Configuring the Output Signal Level
Via Jumper JP1 on the back side of the RTC
®
5 (see
figure 3 on page 40 ), the level of all output signals at
the EXTENSION 1 connector (DIGITAL OUT0-15,
LATCH_OUT, SYNC_OUT, BUSY OUT, VCC_OUT) can be
configured for 5 V or 3.3 V (see
page 28 ).
For user monitoring purposes, the selected signal
level is also continuously outputted at pin (35): signal
VCC_OUT. VCC_OUT is referenced to PC ground
(GND). The maximum current load is 100 mA.
16-Bit Digital Input and Output
The 40-pin EXTENSION 1 connector provides a 16-bit
digital TTL input and a buffered 16-bit digital TTL
output (see
figure 15 ). The level of all output signals
must be configured with a jumper (see above).
For programming the input and output see
"16-Bit Digital Input", page 207 ,
"16-Bit Digital Output Port", page 203 and
"Conditional Command Execution", page 213 .
The input and output signals are referenced to PC
ground (GND). The maximum current load of the
output signals is 8 mA.
Synchronization of Data Transmission
If several bits are simultaneously transferred as a data
words (i.e. if the bits are not transferred indepen-
dently from each other) via the 16-bit digital output
port or the 16-bit digital input port, then the LATCH
or SYNC signal (respectively) should be used for
synchronization of data transmission.
The LATCH signal (a 5 µ s pulse, active-high) is
outputted at pin (33) as a trigger signal for acquiring
the output values of the 16-bit digital output port.
The RTC
®
5 automatically generates the LATCH signal
when the output value at the 16-bit digital output
port changes. The output value should be read-out
with the rising edge of the LATCH signal, which is
generated 5
µ s after the value change at the 16-bit
digital output port (see figure 16 ).
To synchronize data transmission at the 16-bit digital
input port, pin (34) continuously provides a SYNC
signal (a square wave with 5
µ
s pulse length and 10
µ
s period). Value changes at the 16-bit digital input
port should be made with a falling edge of the SYNC
signal. The RTC
®
5’s DSP always accepts the currently
provided value with the rising edge of the SYNC
signal (see
figure 16 ).
The synchronization signals are referenced to PC
ground (GND). The maximum current load is 10 mA.
BUSY Status
The BUSY OUT signal at pin (36) is identical to the
BUSY OUT signal at the LASER connector (see
page 46 ). The signal is referenced to GND.
(2) DIGITAL IN0
(4) DIGITAL IN1
(6) DIGITAL IN2
(8) DIGITAL IN3
(10) DIGITAL IN4
(12) DIGITAL IN5
(14) DIGITAL IN6
(16) DIGITAL IN7
(18) DIGITAL IN8
(20) DIGITAL IN9
(22) DIGITAL IN10
(24) DIGITAL IN11
(26) DIGITAL IN12
(28) DIGITAL IN13
(30) DIGITAL IN14
(32) DIGITAL IN15
(34) SYNC OUT
(36) BUSY OUT
(38) +5 V
(40) GND
15
DIGITAL OUT0 (1)
DIGITAL OUT1 (3)
DIGITAL OUT2 (5)
DIGITAL OUT3 (7)
DIGITAL OUT4 (9)
DIGITAL OUT5 (11)
DIGITAL OUT6 (13)
DIGITAL OUT7 (15)
DIGITAL OUT8 (17)
DIGITAL OUT9 (19)
DIGITAL OUT10 (21)
DIGITAL OUT11 (23)
DIGITAL OUT12 (25)
DIGITAL OUT13 (27)
DIGITAL OUT14 (29)
DIGITAL OUT15 (31)
LATCH OUT (33)
VCC OUT (35)
+5 V (37)
GND (39)
Pin-out of the 40-pin on-board EXTENSION 1 connector
16
SYNC
DIGITAL OUT
LATCH
DIGITAL IN
5 µs 10 µs
Time
Data change Data acquisition
Data change
Data acquisition
Synchronization of data transmission via LATCH or SYNC signal