9 - figure 6, Serial communication interface – Intek RheoVac DR User Manual
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Figure 6
Serial Communication Interface
Figure 7 Distribution Box
4. Serial Communication: Connector JP3 on the
CPU interface PWA (printed wiring board
#08017-1) is the RS-232 serial communication
interface. This interface should only be used for
distances of 20 feet or less, such as to a laptop
computer. A 20-foot serial cable with a DB-9
connector is available from Intek upon request (see
Figure 6 and Table I).
An RS-422 serial
communication interface is present for long data
communications when configured without 4-20
mA outputs. Note: Intek recommends using the
network connection for all data transmissions and
RheoVac communications.
TABLE I. RJ-11 to DB Module Adapter
RS-232 CONFIGURATION
RS-422 CONFIGURATION
RJ-11 Pin Out
DB-9 Pin Out
RJ-11 Pin Out
DB-9 Pin Out
1
Tx (transmit)
1
N/C
1
T x + ( t r a n s m i t + )
1
Rx- (receive-)
2
N/C
2
Tx (transmit)
2
Tx- (transmit-)
2
Rx+ (receive+)
3
Rx (receive)
3
Rx (receive)
3
Rx+ (receive+)
3
Tx+ (transmit+)
4
N/C
4
N/C
4
Rx- (receive-)
4
N/C
5
Power (+5V)
5
Ground
5
Power (+5V)
5
Ground
6
Ground
6
Pulled high
6
Ground
6
Tx- (transmit-)
7
N/C
7
7
TBD
8
Pulled high
8
8
TBD
9
N/C
9
9
B. Distribution Box (optional) (see Figure 7)
1. Connect the RS-485 wires (blue, white and shield) and 24Vdc power (red and black)
from the main processor unit.
2. Install ½” liquid-tight conduit between the
distribution enclosure and the probes unless
½” rigid conduit is used for long distance
runs. Use a minimum of 6 feet of liquid-
tight at the probes.
3. The probe connector comes with an adapter
which allows the attachment of the ½”
flexible conduit connector.
4. Connect the probes to the distribution
enclosure using the manufacturer supplied
four conductor shielded cable to any of the
screw terminals labeled JP3 to JP6. Probe
cable connections are shown in Figure 7.
5. Optional - Connect the transmitter box to the
distribution box using the supplied RS-485
cable.