Campbell CR510, Руководство оператора

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6-1
SECTION 6. 9-PIN SERIAL INPUT/OUTPUT
6.1 PIN DESCRIPTION
All external communication peripherals connect
to the CR510 through the 9-pin subminiature D-
type socket connector located on the front of
the Terminal Strip (Figure 6.1-1). Table 6.1-1
shows the I/O pin configuration, and gives a
brief description of the function of each pin.
FIGURE 6.1-1. 9-pin Female Connector
TABLE 6.1-1. Pin Description
ABR = Abbreviation for the function name.
PIN = Pin number.
O = Signal Out of the CR510 to a
peripheral.
I
= Signal Into the CR510 from a
peripheral.
PIN ABR I/O Description
1 5 V O 5V: Sources 5 VDC, used
to power peripherals.
2 SG Signal Ground: Provides
a power return for pin 1
(5V), and is used as a
reference for voltage
levels.
3 RING I Ring: Raised by a
peripheral to put the
CR510 in the
telecommunications
mode.
4 RXD I Receive Data: Serial
data transmitted by a
peripheral are received
on pin 4.
5 ME O Modem Enable: Raised
when the CR510
determines that a
modem raised the ring
line.
PIN ABR
I/O Description
6 SDE O Synchronous Device
Enable: Used to
address Synchronous
Devices (SDs), and can
be used as an enable
line for printers.
7 CLK/HS I/O Clock/Handshake: Used
with the SDE and TXD
lines to address and
transfer data to SDs.
When not used as a
clock, pin 7 can be used
as a handshake line
(during printer output,
high enables, low
disables).
8 12 V: Sources
continuous 12 V, used to
power telephone
modems.
9 TXD O Transmit Data: Serial
data are transmitted
from the CR510 to
peripherals on pin 9;
logic low marking (0V)
logic high spacing (5V)
standard asynchronous
ASCII, 8 data bits, no
parity, 1 start bit, 1 stop
bit, 300, 1200, 9600,
76,800 baud (user
selectable).