OPERATION MANUAL CompoBus/S

Remote Terminals Section 5-1
182
Switch Settings
Rotary and DIP switches are used to enter settings.
Rotary Switch DIP Switch
Node number setting
Reserved
(Always OFF)
Hold/Clear outputs for
communications error
Communications mode
setting (SRT2 Series)
or
Reserved (Always OFF)
(SRT1 Series)
Note 1. Always turn the Slave OFF before changing DIP switch settings.
2. In the SRT1 Series, pin 3 must always be left OFF. Otherwise, the Unit may
not function correctly.
3. All pins marked “RSV” (reserved) must be left OFF. If any of them is ON,
the Unit may not function correctly.
Node Number Settings
The rotary switch specifies node numbers as hexadecimal numbers, as
shown below.
Node number Setting
(Hexadecimal)
Node number Setting
(Hexadecimal)
0 0 8 8
1 1 9 9
2 2 10 A
3 3 11 B
4 4 12 C
5 5 13 D
6 6 14 E
7 7 15 F
Note 1. A 16-point I/O Slave is handled as a single 8-point Input Slave and a single
8-point Output Slave that possess the same node number.
2. The actual node number setting range depends on the type of PLC in
which the Master is mounted as well as the Master’s settings. Refer to 2-1
Communications Specifications for details.
Communications Mode Settings (SRT2 Series Only)
The communications mode is set with pin 3, as shown below.
Pin 3 CommunicaCommunicaCommunicaCommunications mode tions distance tions baud rate tions cycle time
OFF High-speed Communications
Mode
100 m max. 750 kbps 0.5 or 0.8 ms
ON Long-distance
Communications
Mode
500 m max. 93.75 kbps 4.0 or 6.0 ms
The communications mode settings using pin 3 only apply to the SRT2 Series
and cannot be used with the SRT1 Series, which operate in High-speed Communications
Mode at all times.