Campbell Scientific RF300-Series DRL VHF/UHF Radio Transceivers - Manual (Page 29)

SECTION 3. RADIOTELEMETRY NETWORK COMPONENTS
3-11
The RF232's 25-pin female port connects to the
computer's 25-pin RS232 port. The RF232A's
25-pin port is configured as Data
Communications Equipment (DCE) for direct
cable connection to Data Terminal Equipment
(DTE), such as an IBM-PC serial port. Table
3-9 shows the pin description.
3.5.2 220, 230, AND 240 VAC CONVERSION
The RF232 can be used with 220, 230, or 240
VAC if a small wiring modification is done.
1. First, disconnect any AC power!
2. Lift the cover off the RF232A and locate the
power supply (P/N 4918) as shown in
Figure 3-8.
3. Unscrew the four Phillips head screws on
top of the power supply and turn the power
supply upside down.
4. Clip the wire ties holding the power supply
leads to the base.
5. With the power supply on its back, locate
pins 1 through 5. The power supply is
shipped from the manufacturer configured
for 120 VAC with pins 1 and 3 jumpered,
pins 2 and 4 jumpered, and AC power
coming onto pins 1 and 4. These
connections must be desoldered.
6. Resolder the pins as shown in Table 3-10
for the Power Conversion you require.
TABLE 3-9. Pin Description for RF232A's
25-Pin Port
Pin I/O Description
1
−
Ground
2 I TX
3 O RX
4 I RTS
20 I DTR
22 O RING
TABLE 3-10. RF232A Power Conversions
Pins Jumpered Apply AC
110 VAC 1-3, 2-4 1-4
120 VAC 1-3, 2-4 1-4
220 VAC 2-3 1-5
230 VAC 2-3 1-4
240 VAC 2-3 1-4
FIGURE 3-7. The RF232A Base Station