Flowserve DDC-100 Modbus Direct-to-Host - Manual (Page 25)

44 DDC-100 Direct-to-Host Programming Guide FCD LMAIM4019-00 FCD LMAIM4019-00 DDC-100 Direct-to-Host Programming Guide 45
to place it in the transmit or receive mode. This converter requires that the Host serial port driver
software must toggle RTS or DTR in order to steer the converter.
There are five LED indicators, one DIP switch, two connectors, and a selector switch to select
between 110 and 220 VAC power. The placement of the indicators, switches, and connectors is
shown in the photographs of the front and back panels of the converter enclosure in Figure 5.3. All
jumpers are located inside the enclosure. The LEDs are labeled with their functions, and the DIP
switch, connectors, and jumpers are detailed below:
Figure 5.3 – Front and Back Panels of Steered Converter
Table 5.4 – RS-232/RS-485 Converter (P/N 61-825-0966-4) DIP Switch
Functions
Switch Function
1
Down RTS Steering (Default)
Up RTS Steering OFF
2
Down DTR Steering
Up DTR Steering OFF (Default)
3
Down Normal Steering, Transmit when RTS or DTR high (Default)
Up Inverted Steering, Transmit when RTS or DTR low
4 Up (Default)
5 Up (Default)
6 Up (Default)
7 Up (Default)
8 Up (Default)
Table 5.5 – RS-232/RS-485 Converter (P/N 61-825-0966-4) RS-232
Connector
RS-232
Connector
Pin Number
Function
1 Carrier Detect
2 Transmit Data (TxD) 1
3 Receive Data (RxD) 1
4 DTR
5 Signal Ground
6 DSR
7 RTS (in)
Note 1: The pin numbers of these signals can be reversed with jumpers inside the
converter box (see Table 5.7).
Table 5.6 – RS-232/RS-485 Converter (P/N 61-825-0966-4) RS-485
Connector
RS-485
Connector
Pin Number
Function
1 Data
2 Data* 1 ground
3 Earth ground 2
4 RS-485 RTS steering
5 RS-485 RTS* 1 steering
Note 1: Indicates negative side of signal.
Note 2: Must be connected to earth ground to ensure surge protection.
c WARNING: Disconnect the converter from the power source and from the Host and
network before removing the cover. Potentially lethal voltages are present inside the
enclosure when it is connected to the power source.
Table 5.7 – RS-232/RS-485 Converter (P/N 61-825-0966-4) Jumpers
Jumper 1 Function
JP1 and JP2
Bias and line termination for RS-485 data lines
Position 1:2 (ON) adds bias and termination
Position 2:3 (OFF) removes bias and termination
Both jumpers must be set to the same position
JP3 and JP4
Bias and line termination for RS-485 steering lines
Position 1:2 (ON) adds bias and termination
Position 2:3 (OFF) removes bias and termination
Both jumpers must be set to the same position
JP5
Reverses RS-232 TxD and RxD lines
DCE 1:3, 2:4
DTE 3:5, 4:6 (Default)
Note 1: The jumpers JP1 through JP5 are located inside the converter. The enclosure
must be opened for access. The positions for the jumpers are shown in the silkscreen
on the PC board.
5.1.2 RS-232/RS-485 Converter
with RS-485 Self-Steering (P/N 61-825-1032-4)
This converter provides the same network capabilities as the steered converter, but this converter
does not require the RTS or DTR signals from the Host RS-232 port.
There is a patented self-steering circuit in this converter that senses the direction of data, processes
the data, and retransmits it via the appropriate output port. The data is processed using a noise
elimination circuit ensuring that only valid data is retransmitted. Received data is sent to the self-
steering circuit for proper port direction control and signal processing. The data bits are checked,
recentered, and reclocked before being directed to the proper output port.
Six LED indicators, two connectors, and a selector switch to select between 110 and 220 VAC
power are located on the enclosure. The placement of the indicators, connectors, and the switch is
shown in the photographs of the front and back panels in Figure 5.4. All jumpers are located inside
the enclosure. The LED indicators are labeled with their functions, and the connectors and jumpers
are detailed below: