Campbell CR23X Especificações descarregar pdf (Página 80)

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SECTION 6. 9-PIN SERIAL INPUT/OUTPUT

6-2

TABLE 6.2-1. Pin Description

ABR = Abbreviation for the function name.

PIN = Pin number.

O = Signal Out of the CR10X to a peripheral.

I = Signal Into the CR10X 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 CR10X 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 CR10X determines that a modem raised the

ring line.

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 VDC

9 TXD O Transmit Data: Serial data are transmitted from the CR10X 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).

(ME)

MODEM

(COM200

RF95

SC32A)

FIGURE 6.2-1. Hardware Enabled and Synchronously Addressed Peripherals

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 373 374

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