Rpi Cables; Eeprom Data Storage; Hardware Hookup; Miscellaneous Program Information - E.F. Johnson LTR-Net 7243 Service Manual

7.5vdc 1 and 4 watts part no. 242-7243-xxx
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injecting the transmit audio signal and monitoring
receive audio during alignment (see Section 5). Earlier
RPI's, such as Part No. 023-5810-000 or 023-9750-
000, can be used to perform the standard personality
programming described in most of this section.
When programming this transceiver, the switch on
the front panel of the RPI selects either the standard or
Flash programming mode. The standard mode is
selected when it is away from the LED and the indi-
cator is green, and the Flash mode is selected when it is
toward the LED and the indicator is amber. The stan-
dard mode should be selected for all but Flash
programming.
With remote mount mobile transceivers, this
switch is used to turn transceiver power on and off. A
separate 9-16 VDC, 200 mA power supply (such as
P.N. 563-0001-005) must then be plugged into the RPI
power jack to provide power to the RPI.

3.1.4 RPI CABLES

The cables from the RPI to the computer and
transceiver are not included with the RPI. The RPI has
a female DB9 connector, and most computer serial
ports have a male DB9 or male DB25 serial connector.
Therefore, a male DB9 to either a female DB9 or
female DB25 cable is usually required. This is a stan-
dard cable available at most electronic and computer
supply stores. Suitable cables are also available from
the E.F. Johnson Company as listed in Table 1-1.
The cable from the RPI to the transceiver has an
8-pin telephone style connector on the RPI end and a
connector compatible with the accessory connector on
the transceiver end. The cable for this application is
also listed in Table 1-1.

3.1.5 EEPROM DATA STORAGE

Most personality information programmed in the
following sections is stored in the EEPROM memory
device (U150). EEPROM devices store data indefi-
nitely without the need for a constant power supply.
The battery can be removed from the transceiver indef-
initely without affecting programming.
If the operating program needs to be updated,
reprogramming is performed using special program-
ming software and the same setup used for personality
programming. Refer to Sections 3.12 and 5.2 for more
information.

3.1.6 HARDWARE HOOKUP

The programming setup is shown in Figure 3-1.
The RPI-to-transceiver cable is connected from the
8-pin jack of the RPI to the accessory connector of the
transceiver (make sure it is connected with the cable
end up as shown in Figure 3-1). The RPI-to-computer
cable is connected from the serial port of the computer
to the DB9 connector on the RPI.
The RPI has a switch which selects standard or
Flash modes. Turn on transceiver power and then make
sure that the standard mode indicated by a green LED
is selected (position away from LED).
If it is the first time the program is run and a port
other than Serial Port 1 (COM1) is used, the serial port
may have to be selected. Refer to Section 3.9 for more
information.
3.2 MISCELLANEOUS PROGRAM
INFORMATION

3.2.1 BASIC WINDOWS KNOWLEDGE

With the descriptions which follow in this section,
it is assumed that you have a basic understanding of
how to use your Windows-based operating system. If
you are not familiar with some of the Windows func-
tions described, refer to the Windows Help Screens and
any manuals that may have been included with your
Windows software.

3.2.2 SOFTWARE INSTALLATION

The programming software is supplied on a CD-
ROM. Install this software as follows:
1. Make sure that there are no other Windows applica-
tions open during this installation procedure. This
also includes programs represented by icons in the
system tray (the area where the time is usually
displayed). Also, make sure that the computer meets
the minimum requirements listed in Section 3.1.2.
2. Insert the CD-ROM in the CD drive of your
computer.
3-2
PROGRAMMING
November 2001
Part No. 001-7240-001

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