Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Uživatelský manuál stáhnout pdf (Strana 34)

2–5Understanding DF1 Protocol

Publication

17706.5.16 - October 1996

Allen-Bradley interface modules send data serially over the

RS-232-C/RS-422-A interface, one 10-bit byte—11-bit byte with

parity—at a time. The transmission format conforms to ANSI

X3.16, CCITT V.4, and ISO 1177 standards, with the exception that

the parity bit is retained while the data length is extended to eight

bits. Make sure that your computer conforms to this mode of

transmission. The transmission format is:

No Parity

start bit

data bit 0

data bit 1

data bit 2

data bit 3

data bit 4

data bit 5

data bit 6

data bit 7

one stop bit

With Parity

start bit

data bit 0

data bit 1

data bit 2

data bit 3

data bit 4

data bit 5

data bit 6

data bit 7

even parity bit

one stop bit

For all DH, DH+, and DH485 interface modules, you must comply

with this transmission format. For communication rates and parity

settings, refer to your module’s user manual.

Character Transmission

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 250 251

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Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Uživatelský manuál Strana 34