Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 41)

100

101

Chapter

Using the Communication Ports

2 -3

PRT1 and PRT2 Transmit and Receive Buffers

Ports PRT1 and PRT2 each have a 256-character receive (input) buffer and

a 256-character transmit (output) buffer. Data in these buffers are

monitored by circular queues. If a queue detects that a buffer is full (i.e.,

the buffer has 256 characters waiting to be serviced), and handshaking is

enabled (software or hardware), then the queue does not allow new

characters to enter the buffer until existing characters have been serviced

and room is available for the new characters.

DH485 Port

The DH485 port uses the DH-485 communication mode to communicate

with SLC processors. The DH485 port has an RJ-45 connector. Use the

standard Allen-Bradley cables (cat. no. 1747-C10,1747-C11, 1747-C20)

for all DH-485 interconnects.

The DH485 port is not electrically isolated.

20376–M

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