Configuration Using Link Unit; No Response (Response Not Yet Received), Or Occurrence Of Illegal Characters - Omron V700-HMD13 series User Manual

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:
RUN
Normally lit Lit during communication service
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
State of indicators (
RUN COMM
*1
*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)
State of indicators (
RUN COMM
*2 For further details, see Sec. 2.3.2(1) Upstream controller connection port specifications.
COMM
: lit, : unlit)
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)
• Same node No. has been assigned to two or more link units within a same
*1
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.
: lit, : unlit)
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.
ID
Lit during communication with IDRW
Typical checkpoint
Typical checkpoint
Section 7
Troubleshooting
ERR
Normally unlit
V700-L11
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User's Manual