(3)Station number switch (STA NO.)
Make sure to set the master station number to "00." For slave stations, set from "01" to "77" in octagonal sequence.
-Maximum amount of slave stations to be connected are
63.As the station number should be assigned by octagonal figures, setting of the following values causes errors and the
08, 09, 18, 19, 28, 29, 38, 39, 48, 49, 58, 59, 68, 69, and
78to 99.
-Be careful that there is no doubly allocated number and no number has been skipped.
STA NO. | STA NO. | |||||
6 | 7 | 8 |
| 6 | 7 | 8 |
|
| 9 |
| 9 | ||
|
|
|
|
| ||
5 |
|
| 0 | 5 |
| 0 |
4 | 3 |
| 1 | 4 | 3 | 1 |
| 2 | ×10 |
| 2 | ||
|
|
|
|
|
| |
(Factory setting: 00)
×1
(Front side)
(4)Termination resistance switch (LT)
When the
| Turn ON the termination resistance switches |
|
| 11 |
| for these two stations. |
| 3456 | |
|
|
| 2 | 7 |
|
|
| 01 | 8 |
|
|
| F | |
|
|
| E | A9 |
|
|
| DCB | |
Setting | Condition of the |
|
|
|
ON | Insert a termination resistance | ON |
|
|
OFF | Do not insert a termination resistance | LT |
| |
OFF |
| |||
- When using a termination | (Factory setting: OFF) |
| ||
Denshi) (device to function as terminator) at the end |
| |||
of a signal cable, turn "OFF" the termination resis- |
|
|
| |
tance switch of the termination station. |
|
| (Rear side) | |
Termination | Termination |
| ||
| 1 km max. |
| Termination |
| |
Reference | Need for the termination resistance |
When a termination resistance is not provided at a communication circuit end, the end of the circuit generates reflection waves. These reflection waves collide with sending signals and abnormal communication may occur. The termination resistance prevents the occurrence of these reflection waves. On the other hand, when an intermediate station has its termination resistance switch turned "ON," this station causes reflection and attenuates signals and causes abnormal communication.