Campbell CR800 Series, Руководство оператора

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553
Appendix B. Serial Port Pinouts
B.1 CS I/O Communication Port
Pin configuration for the CR800 CS I/O port is listed in table
Pinout of CR800 CS
I/O D-Type Connector Port
(p. 553).
Pinout of CR800 CS I/O D-Type Connector Port
Pin
Number
Function
Input (I)
Output (O)
Description
1 5 Vdc O
5 Vdc: 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
CR800 in the telecoms mode.
4 RXD I
Receive data: derial data transmitted by a
peripheral are received on pin 4.
5 ME O
Modem enable: raised when the CR800
determines that a modem raised the ring
line.
6 SDE O
Synchronous device enable: addresses
synchronous devices (SD); used as an
enable line for printers.
7 CLK/HS I/O
Clock/handshake: with the SDE and
TXD lines addresses and transfers 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 Vdc
Nominal 12 Vdc power. Same power as
12V and SW12 terminals. See
TABLE:
Current Source and Sink Limits
(p. 389).
9 TXD O
Transmit data: transmits serial data from
CR800 to peripherals on pin 9; logic-low
marking (0V), logic-high spacing (5V),
standard-asynchronous ASCII: eight data
bits, no parity, one start bit, one stop bit.
User selectable baud rates: 300, 1200,
2400, 4800, 9600, 19200, 38400,
115200.