Intek RheoVac 950A - Manual (Page 11)

- 9 -
A. Main Processor Unit (see Figure 5)
1. Sensor Power and Communication Line: Connect the distribution box to this main
processor box using the RS-485 communications/power cable. Follow indicated
connector color code. [communications: white (A), blue (B) and shield (SH); power:
24Vdc, red (+), and black ()]
2. Main Power: Connect main power terminals to a dedicated 100-250Vac, single phase,
15-amp circuit. An external disconnect switch should be used for disconnecting power to
the system during outages. Power connection wires should be at least 18 gauge and
comply with accepted wiring codes. SW1 on the power input PWA (printed wiring
board #01011-5) is used for cycling power to reset.
3. Network Connection (Recommended): The Ethernet connection at CN3 on the CPU
interface PWA (printed wiring board #08017-1) is an RJ-45 style jack. A 10-foot
Ethernet Cat5 crossover cable is supplied with the unit for laptop connections. Intek
recommends using this connection for all data transmissions and RheoVac
communications because:
a. More measured data is accessible through the network connection.
b. Software and calibration file updates can be done remotely.
c. Archived data files can be easily retrieved and analyzed by Intek through online
software available at www.MyCondenser.com .
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 1). 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 1 RJ-11 to DB-9 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 Tx+ (transmit+) 1 RxS (receiveS)
2 N/C 2 Tx (transmit) 2 TxS (transmitS) 2 Rx+ (receive+)
3 Rx (receive) 3 Rx (receive) 3 Rx+ (receive+) 3 Tx+ (transmit+)
4 N/C 4 N/C 4 RxS (receiveS) 4 N/C
5 Power (+5V) 5 Ground 5 Power (+5V) 5 Ground
6 Ground 6 Pulled high 6 Ground 6 TxS (transmitS)
7 N/C 7 7 TBD
8 Pulled high 8 8 TBD
9 N/C 9 9 TBD