ISR 12-LO/GS Manual
Controls and Installation
•
17
When using a converter RS485
RS232 take care, that the converter is fast enough to receive
the pyrometer’s answer to an instruction of the master. Most of the commonly used converters
are too slow for fast measuring equipment. So, it is recommended to use the IMPAC-converter
(order no. 3 852 430).
With a slow RS485 connection it is also possible to set a wait time at the pyrometer which delays
the response of a command to the pyrometer (see
4.15
Wait time
).
3.2.1
Connecting to RS232 interface
The transmission rate (in baud) of
the serial interface is dependent on
the length of the cable. Values
between 2400 and 115200 Bd may
be set.
The baud rate must be reduced by
50% when the transmission
distance is doubled (see
4.13 Baud rate (kBaud)
).
Typical cable length for RS232 at
19200 Bd is 7 m.
PC’s side
(soldering side)
K
A
B
C
D
J
G
F
E
H
M
L
1 2 3 4 5
6 7 8 9
DGND (red)
RxD (black)
TxD (violet)
Pyrometer’s side
(soldering side)
3.2.2
Connecting to RS485 interface
Half-duplex mode:
A1 and A2 as well as B1 and B2 are
bridged in the 12-pin round connector
of the connecting cable, to prevent
reflections due to long stubs. It also
safeguards against the interruption of
the RS485 Bus system should a
connecting plug be pulled out. The
master labels mark the connections on
the RS485 converter. The transmission
rate of the serial interface in Baud (Bd)
is dependent on the length of the
cable. Values between 2400 and
115200 Bd may be set.
The baud rate is reduced by 50% when
the transmission distance is doubled (see
4.13 Baud rate (kBaud)
). Typical cable
length for 19200 Bd is 2 km.
Terminator 120 Ohm
A
B
S
K
A
B
C
D
J
G
F
E
H
M
L
K
A
B
C
D
J
G
F
E
H
M
L
K
A
B
C
D
J
G
F
E
H
M
L
DG
ND
B1
A2
B2
A1
DG
ND
B1
A2
B2
A1
DG
ND
A2
B2
A1
B1
Master
Pyrometer 32
e.g. address 31
Pyrometer 2
e.g. address 01
Pyrometer 1
e.g. address 00
Содержание IMPAC ISR 12-LO/GS
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