Studio Technologies 45A User Manual

Page 25

Model 45A User Guide

Issue 2, November 2011

Studio Technologies, Inc.

Page 25

support and troubleshooting situations. The

ﬁve “from” 4-wire LEDs are used to display

the major release number with a range of

1 through 5. The ﬁve LEDs associated with

“to” 4-wire channel 1 are used to display

the release sub-number which ranges from

1 through 5. Refer to Figure 8 for a detailed

view of the LEDs and the corresponding

software version numbering scheme. The

Model 45A’s initial software release is ver-

sion 1.1 which is represented by the bottom

LED of each column being lit.
To display the Model 45A’s software version

is very simple. From the powered-down

state, press and hold the auto null button.

While continuing to press the auto null but-

ton, apply power either by connecting an

external 24 volt DC power source or a pow-

ered intercom circuit. The normal power-up

sequence will not occur but instead one

LED in the status column will be lit and one

LED in the column associated with “from” 4-

wire channel 1 will also be lit. As previously

described, these two LEDs represent the

unit’s current software version. After the

software version number has been “read”

the auto null button can be released. At

this time the unit will begin its normal

power-up sequence.
Note that while it’s easy to determine

which software version is loaded into the

Model 45A a trip back to the factory is

required to update it. The 8-bit micro-

controller that provides the unit’s logic

“horsepower” also includes internal

FLASH memory. This nonvolatile memory

is used to store the operating software

(“ﬁrmware”). Re-programming this mem-

ory requires using a specialized program-

ming unit. While not outrageous in price,

it still costs in the range of US$500. The

programmer uses a ribbon cable and

socket to interface with a 6-pin “header”

on the Model 45A’s printed circuit board.

And, as you would guess, once connected

reprogramming takes only a matter of sec-

onds. But unfortunately the programmer

Figure 8. Detail of front panel showing the status LEDs that display

the software version. In this example, the software version is 1.3.

Major Release Number

Release Sub-Number

.3 

