Parker OEM750, Руководство пользователя

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OEM750 •
➁
Installation
31
Rx
Tx
Gnd Tx
Rx
Gnd Tx
Rx
Gnd Tx
Rx
Gnd
REMOTE
REF
CURRENT
DUMP
VDC+
VDC-
A+
A-
B+
B-
PWR/FLT
OEM
series
!
7
5
0
IN
D EX
ER
7
5
0
IN
D
EXER
REMOTE
REF
CURRENT
DUMP
VDC+
VDC-
A+
A-
B+
B-
PWR/FLT
OEM
series
!
7
5
0
IN
D EX
ER
7
5
0
IN
D
EXER
REMOTE
REF
CURRENT
DUMP
VDC+
VDC-
A+
A-
B+
B-
PWR/FLT
OEM
series
!
7
5
0
IN
D EX
ER
7
5
0
IN
D
EXER
Daisy Chain Configuration
Commands prefixed with a device address control only the
drive specified. Commands without a device address control
all drives on the daisy chain. The general rule is:
Any com-
mand that causes the drive to transmit information from the RS-
232C port (such as a status or report command), must be
prefixed with a device address
. This prevents daisy chained
drives from all transmitting at the same time.
Attach device identifiers to the front of the command. The Go
(
G ) command instructs all drives on the daisy chain to go,
while 1G tells only drive #1 to go.
When you use a single communications port to control more
than one OEM750X, all drives in a daisy chain receive and
echo the same commands. Each drive executes these com-
mands, unless this command is preceded with an address
that differs from the drives’ addresses on the daisy chain. This
becomes critical if you instruct any drive to transmit informa-
tion. To prevent all of the drives on the line from responding
to a command, you must precede the command with the
device address of the designated drive. No OEM750X executes
a drive-specific command unless the drive number specified
with the command matches the OEM750X's drive number.
Drive-specific commands include both buffered and immedi-
ate commands.