SECTION 3. RADIOTELEMETRY NETWORK COMPONENTS
3-9
The RF232T Base Station includes an RF95T
Modem with a carrier detect light. The RF95T
Modem sits directly behind the RF232T front
panel. For a description of the Carrier Detect
Light and the communication protocol, refer to
Section 3.1 "RF95T Modem." The Station ID
Number of the RF95T comes shipped from the
factory at 1. Under most circumstances there is
no need to change this address.
The RF232's 25-pin female port connects to the
computer's 25-pin RS232 port. The RF232T's
25-pin port is configured as Data Communi-
cations 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 RF232 and locate the
power supply (P/N 4918) as shown in
Figure 3-8.
3. Unscrew the four Phillips-head screws on
top of power supply and turn 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 RF232'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. RF232 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 RF232T Base Station
