Operation; Leds; How The Unit Handles Caller Id Information - Black Box TE120A User Manual

We recommend that the first time you start up your Caller ID system,
you test it as described in Section 6.1.

5.1 LEDs

There are two LEDs on the front panel of each Caller ID unit. One is the Power
LED, which lights as soon as the unit starts receiving power. The other is the DATA
LED, which flashes to show that data is being sent from the Caller ID unit to the
DTE. (A unit won't light its DATA LED unless it's connected to a powered DTE—
specifically, it needs to receive Pin 7, RTS, active/high on its RS-232 OUT port.)

5.2 How the Unit Handles Caller ID Information

The Caller ID unit receives standard Caller ID information from the telephone
company's central office as Bell
rings of the phone call. The Caller ID unit takes this information, formats it as an
ASCII text record (as shown in Figure 5-1), prefaces it with the number of the port
on which the call was received, and sends it from its RS-232 OUT port to the DTE.
If handshaking between the Caller ID system and the DTE is prolonged,
data could be lost.
Figure 5-1. Sample Caller ID records produced by the Caller ID unit
(not actual width—filler spaces compressed).
LINE DATE
08 3/24
01 3/24
12 3/24 10:03 AM 1-205-555-4000 L
03 3/24 10:03 AM
10 3/24 10:06 AM
03 3/24
*Labels are shown here at the tops of the columns for clarity only.
No such labels are sent to the DTE.

5. Operation

NOTE
® 202A modem tones, between the first and second
NOTE
TIME PHONE NUMBER
9:15 AM OUT OF AREA
9:16 AM 1-724-555-3407
8:00 PM
L
PRIVATE
555-9818 Bednarski Motor
555-2549
CHAPTER 5: Operation
NAME*
Jane Doe
John Smith
Sam Jones
23