When the COMM lamp of the master station is OFF (SD, RD, and CD are flickering).
Check the following master station's parameters.
Parameter address
Other cases
- Check the switches of the JW-21MN (see check item)
- Check optional cable of PC (The JW-21MN does not operate normally without an optional cable.)
- Check cable and connector (see check item)
- Check error code
[Switches required check in the JW-21MN]
① Station number (STA NO.)
② Mode switch (MODE)
③ Termination resistance switch (LT)
④ Shield ground switch (LG)
If there are errors in the station number and the mode switch, change the setting with the power
OFF, and then turn ON the power.
[Check items of cables and connectors]
① No looseness or removal of connectors (turn the connector right until it completely locks).
② Connectors are appropriately fixed on the cables (When any faults such as extrusion of pins or
connector being easily removed by pulling, reinstall these connectors.)
③ Wiring conditions are appropriate (See chapters 6 and 7).
④ Not too long branch lines (shorter than 400 mm).
⑤ Termination resistance are correctly connected.
(Turn "ON" the termination resistance switch of the end stations or install a termination tool.)
16
(8)
004002
Function (relay/register link)
007777
Start/stop operation of the JW-21MN
Setting
Contents
value
01
01
16-6
(H)
(H)