Unipulse F805AT-BC, Руководство по эксплуатации

Страница: 164 / 202

9.OPTION (Option card required)
149
9-4-3. One to Multi connection
9-4-4. Settings for RS-485
RS-485 communication parameters for the devices connected to F805AT-BC, such as a
PC or PLC, must be compatible with those for F805AT-BC.
Operation
9-4-5. How to communicate
1. If you connect multiple of F805AT-BCs, assign a unique ID to each of F805AT-BCs.
2. START command from the host includes an ID, and activates communication with
the F805AT-BC that has the specified ID number. Thus, communication using R-,
W-, C-command is enabled.
3. END command must be issued before trying to communicate with other F805AT-
BCs.
* START and END commands control tri-state logic of the communication line.
Issuing START commands to multiple of F805AT-BCs will give rise to conflicts,
interfering proper communication.
* Do not use ID=0 in multi-F805AT-BC configuration: F805AT-BC with ID=0 is
automatically enabled to communicate when the device is turned on (without
START command).
* F805AT-BC with non-zero ID will not be enabled for communication until it will
receive a START command (see below). Unless enabled, other command formats
(R..,W.., C.. etc.,) are ignored.
A
B
RD
A
B
SD
A B A B
SD RD
A B A B
SD RD
A B A B
SD RD
A B A B
SD RD
Termination
Twisted-pair
F805AT-BC
Termination resister
120 Ω resister can
The termination resister
F805AT-BC F805AT-BC F805AT-BC
be inserted/removed
by a switch
switch is placed in the
rear panel metal plate.
resister
モード選択 → オプション MODE OPTION
→
Specify valued for the following parameters:
・
Baud rate
・
Character length
・ Parity bit
・
Stop bit
・
Terminator
・
RS-485 ID (0-99)
→
PAGE