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4 8 Data Communication
4 8 Data Communication
Two types of interface are available for Data Communication. These are
Two types of interface are available for Data Communication. These are
RS-485
RS-485
and
and
RS-232
RS-232
interface. Since RS-485 uses a differential architecture to
interface. Since RS-485 uses a differential architecture to
drive and sense signal instead of a single ended architecture which is used for
drive and sense signal instead of a single ended architecture which is used for
RS-232, RS-485 is less sensitive to the noise and suitable for a longer
RS-232, RS-485 is less sensitive to the noise and suitable for a longer
distance communication. RS-485 can communicate without error over 1 km
distance communication. RS-485 can communicate without error over 1 km
distance while RS-232 is not recommended for a distance over 20 meters.
distance while RS-232 is not recommended for a distance over 20 meters.
Using a PC for data communication is the most economic way. The signal is
Using a PC for data communication is the most economic way. The signal is
transmitted and received through the PC communication Port ( generally RS-
transmitted and received through the PC communication Port ( generally RS-
232 ). Since a standard PC can't support RS-485 port, a network adaptor (
232 ). Since a standard PC can't support RS-485 port, a network adaptor (
such as
such as
SNA10A, SNA10B
SNA10A, SNA10B
PC if RS-485 is required for the data communication. But there is no need to
PC if RS-485 is required for the data communication. But there is no need to
be sad. Many RS-485 units ( up to 247 units ) can be connected to one RS-
be sad. Many RS-485 units ( up to 247 units ) can be connected to one RS-
232 port; therefore a PC with 4 comm ports can communicate with 988 units. It
232 port; therefore a PC with 4 comm ports can communicate with 988 units. It
is quite economic.
is quite economic.
Setup
Enters the setup menu.
Enters the setup menu.
Select FULL ( Full function ) for FUNC.
Select FULL ( Full function ) for FUNC.
Select 485 for COMM if RS-485 is required, or 232 if RS-232 is required. Select
Select 485 for COMM if RS-485 is required, or 232 if RS-232 is required. Select
RTU ( ie. Modbus protocol RTU mode ) for PROT. Set individual address as
RTU ( ie. Modbus protocol RTU mode ) for PROT. Set individual address as
for those units which are connected to the same port.
for those units which are connected to the same port.
Set the Baud Rate ( BAUD ), Data Bit ( DATA ), Parity Bit ( PARI ) and Stop Bit (
Set the Baud Rate ( BAUD ), Data Bit ( DATA ), Parity Bit ( PARI ) and Stop Bit (
STOP ) such that these values are accordant with PC setup conditions.
STOP ) such that these values are accordant with PC setup conditions.
NOTE: If the BTC-2500 is configured for RS-232 communication, the EI ( Event
NOTE: If the BTC-2500 is configured for RS-232 communication, the EI ( Event
Input ) and input 2 are disconnected internally. The unit can no longer perform
Input ) and input 2 are disconnected internally. The unit can no longer perform
event input function ( EIFN ) and other input 2 functions.
event input function ( EIFN ) and other input 2 functions.
When you insert a RS-232 module (CM94-2) to the connectors on CPU board
When you insert a RS-232 module (CM94-2) to the connectors on CPU board
(C250), you also need to modify the jumper J51 and J52 according to
(C250), you also need to modify the jumper J51 and J52 according to
2-16.
2-16.
If you use a conventional 9-pin RS-232 cable instead of CC94-1, the cable
If you use a conventional 9-pin RS-232 cable instead of CC94-1, the cable
should be modified for proper operation of RS-232 communication according
should be modified for proper operation of RS-232 communication according
to
to
Section 2-16.
Section 2-16.
76
) has to be used to convert RS-485 to RS-232 for a
) has to be used to convert RS-485 to RS-232 for a
Section
Section
UM25001C
RS-485 Benefits:
RS-485 Benefits:
Long distance
Long distance
Multi-units
RS-232 Benefits:
RS-232 Benefits:
Direct Connection to a PC
Direct Connection to a PC
Order BTC-2500-XXXXX1
Order BTC-2500-XXXXX1
for RS-485
for RS-485
Order BTC-2500-XXXXX2
Order BTC-2500-XXXXX2
for RS-232
for RS-232
RS-485 Setup
RS-485 Setup
FUNC=FULL
FUNC=FULL
COMM=485
COMM=485
PROT=RTU
PROT=RTU
ADDR=Address
ADDR=Address
BAUD=Baud Rate
BAUD=Baud Rate
DATA=Data Bit Count
DATA=Data Bit Count
PARI=Parity Bit
PARI=Parity Bit
STOP=Stop Bit Count
STOP=Stop Bit Count
RS-485 Terminals
RS-485 Terminals
12
TX1
13
TX2
RS-232 Setup
RS-232 Setup
FUNC=FULL
FUNC=FULL
COMM=232
COMM=232
PROT=RTU
PROT=RTU
ADDR=Address
ADDR=Address
BAUD=Baud Rate
BAUD=Baud Rate
DATA=Data Bit Count
DATA=Data Bit Count
PARI=Parity Bit
PARI=Parity Bit
STOP=Stop Bit Count
STOP=Stop Bit Count
RS-232 Terminals
RS-232 Terminals
TX1
12
13
TX2
11
COM
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