Casio CE-7000 Service Manual page 29

Pin No.Pin Name N a m e
20 RXIN
21 nTXEN
16 XTAL1
17 XTAL2
15 VDD
28 VDD
7 VSS
14 VSS
22 VSS
2. ARCNET In-line circuit
The In-line circuit is as follows:
CE-7000 has the ARCNET In-line
board I/0 PB-14.
In/Out Status of OFF Status of ON
Receive IN In L
nTransmit Out L
Enable
Crystal In L
Oscillator In L
Power supply Power GND
Power GND
Powersupply Power GND
Power GND
Power GND
- 27 -
Status of ON Description
No Token Token
H Pulse Receive input. This signal
carries the receive data
information from the line
receiver circuitry to the
COM20019.
L Pulse Transmit Enable output.
This signal used in
backplane mode to
enable the line driver for
transmission. The polarity
of the signal is
programmable by
grounding the nPULSE2
pin.
Normally, connect nTXEN
terminal of HYC2488S or
DE terminal of RS485
driver.
Pulse Pulse An external crystal should
Pulse Pulse be connected to these pin.
If an external TTL clock is
used instead of C-MOS
level, it must be connected
to XTAL1 with 390 ohms
pull-up resistor, and
XTAL2 should be left
floating.
(+5V) (+5V) Power supply +5V
(+5V) (+5V)
GND GND Power supply GND
GND GND
GND GND
ARCNET In-line circuit
board I/0 PB-14