Toshiba GRT100 Series Instruction Manual page 239

Troubleshooting
No. Phenomena
1 Communication
trouble (IEC103
communication is
not available.)
Supposed causes
Address setting is incorrect.
Transmission baud rate setting is
incorrect.
Start bit, stop bit and parity settings of
data that BCU transmits to relay is
incorrect.
The PRTCL1 setting is incorrect. (The
model with PRTCL1 setting.)
RS485 or optical cable interconnection
is incorrect.
The setting of converter is incorrect.
(RS485/optic conversion is executed
with the transmission channel, etc.)
The relationship between logical "0/1" of
the signal and Sig.on/off is incorrect. (In
the event of using optical cable)
Terminal resistor is not offered.
(Especially when RS485 cable is long.)
Relay cannot receive the requirement
frame from BCU.
(The timing coordination of sending and
receiving switch control is irregular in
half-duplex communication.)
The requirement frame from BCU and
the reply frame from relay contend.
(The sending and receiving timing
coordination is irregular in half-duplex
communication.)
Object
BCU Match address setting between BCU and relay.
RY Avoid duplication of address with other relay.
BCU Match transmission baud rate setting between
BCU and relay.
RY
BCU Go over the following settings by BCU. Relay
setting is fixed as following settings.
- Start bit: 1bit
- Stop bit: 1bit
- Parity setting: even
RY Change the PRTCL1 setting. Relation between
PRTCL1 setting and available transmission
protocol is referred to the following table.
RS485 port
at the back
of the relay
COM1
(CH1)
COM2
(CH2)
Cable - Check the connection port.(CH1/CH2)
- Check the interconnection of RS485 A/B/COM
- Check the send and received interconnection of
optical cable.
Converter In the event of using G1IF2, change the DIPSW
setting in reference to INSTRUCTION MANUAL
(6F2S0794).
BCU Check the following;
Logical0 : Sig.on
Logical1:Sig.off
cable Impose terminal resistor (150[ohms]) to both ends
of RS 485 cable.
BCU Check to secure the margin more than 15ms
between receiving the reply frame from the relay
and transmitting the next requirement frame on
BCU.
BCU Check to set the time-out of reply frame from the
relay.
Time-out setting: more than 100ms (acceptable
 
238
6 F 2 S 0 7 8 9
Check / Confirmation
Procedure
PRTCL1 PRTCL1
=HDLC =IEC
HDLC IEC103
IEC103 ―
value of response time 50ms plus
margin)
PRTCL1=
Modbus
Modbus
―