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57
V700-L11
User's Manual
Section 7
7.2 Conf
igura
tion us
ing
link unit
Section 7
Troubleshooting
7.2 Configuration using link unit
7.2.1 No response (response not yet received), or occurrence of ille-
gal characters
In normal communication status, the STATUS indicators will appear as follows:
Check the following points based on the states of STATUS indicators on a link unit that has failed to
communicate.
■
Inability to communicate with any link unit
*1 A situation where the STATUS indicator intermittently lights and turns off though no command is cur-
rently being transmitted.
■
Inability to communicate with particular link unit (communication service is still
possible with certain link unit)
*2 For further details, see Sec. 2.3.2(1) Upstream controller connection port specifications.
RUN COMM ID ERR
Normally lit Lit during communication service Lit during communication with IDRW Normally unlit
State of indicators ( : lit, : unlit)
Typical checkpoint
RUN COMM ID ERR
• Wiring connections of RS-232C cable (wrong connection)
• Command format (availability of [SOH])
• Mismatching of communication protocol (Baud rate, etc) on upstream con-
troller with that of link unit
• Routing of RS-232C cable (adverse effect by external noise interference)
• Mismatching of node No. specified by a command, with that of a link unit
• Command format ([CR], calculation of FCS, inter-command character spac-
ing, etc.)
• Wiring connections of RS-232C cable (adverse effect by external noise inter-
ference)
*1 *1
• Same node No. has been assigned to two or more link units within a same
RFID system.
• Wiring connections of RS-232C cable (wrong connection)
• Switching timing (duration) for send/receive on the upstream controller that
is connected via. RS-485
• Check 24 VDC power supply.
State of indicators ( : lit, : unlit)
Typical checkpoint
RUN COMM ID ERR
• Wiring connections of RS-485 cable (wrong connection)
• Wiring connections of RS-232C cable (wrong connection)
• RS signal control on upstream controller (RS signal is normally OFF; or turns
OFF with a delay after a command was sent) *2
• Mismatching of communication protocol (Baud rate, etc) on upstream con-
troller with that of link unit
• Routing of RS-485 cable (adverse effect by external noise interference)
• Mismatching of communication protocol (Baud rate, etc) on upstream con-
troller with that of link unit
• RS signal control on upstream controller (OFF before command has been
successfully transmitted)*2
• RS signal control on upstream controller (RS signal is normally ON) *2
• Check 24 VDC power supply.