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(b) MEMOBUS Frequency Reference Unit (o1−03, o1−04)
Enabled when bit 0 of register No. 0F is "1". The frequency reference units, the frequen-
cy reference and output frequency monitors from master are indicated. The unit is 0.01
Hz when bit 0 of register No. 0 is "0".
(c) MEMOBUS Slave Address (H5−01)
The slave address number is set. Set another slave address number connected on the same
transmission line.
11 35 36
E
2
1
ª
Fig. 18
Arrangement of Control Circuit Terminals, SW1 and SW2
(3) Functions of SW1 and SW2
(a) SW1 (for terminating resistor)
Provide a terminating resistor to each receiver side when transmission is perfomed by
RS−422A (four−wire system) between one master and one slave. Provide a terminating
resistor in devices (both ends) connected to the communication cable when transmission
is performed by RS−485 (two−wire system) between one master and more than one slave.
The VS−616G5 is provided with a built−in terminating resistor. Switch the resistor ON/
OFF by SW1.
Table 27
Functions of SW1
Communication Cable
Connecting Method
Four−wire system (1 to 1)
Two−wire system (1 to n)
(b) SW2
Table 28
Functions of SW2
Transmission Method
RS−422A (four−wire system)
RS−485 (two−wire system)
SW2
SW1
485
OFF
422
2
1
13 14 15 16 17
33
25 27 26
8
21 22 23
3
4
5
6
7
Switch both 1 and 2 to the ON side (numbering side).
Switch 1 to the OFF side and 2 to the ON side only for devices (both ends)
connected to the communication cable. For other devices, switch both 1 and
2 to the OFF side.
5
SETTING OPERATION CONDITIONS
42 43
18 19 20
E
37
41
40
9
ª
SW1 Setting
SW2 Setting
To 422 side
To 485 side
10
59
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