TM8400B-L-00
1 November 2004
7. INSTALLATION AND OPERATING INSTRUCTIONS
FOR OPTIONAL BCD OUTPUT
7.1. GENERAL
The BCD output provides complete digital output of the display reading and bottle number
dialed, as well as a "Write Enable" signal. All outputs are fully buffered, TTL compatible and
use positive logic. A double shielded 50 pin Male to 50 pin Female cable 5 feet long, is
recommended for use with this output. The double shielded cable is available as Guildline part
number 996-23200.
7.2. BCD CONNECTOR PIN CODE
The BCD output uses a 50-pin connector on the instrument back panel. Connector pinouts are
shown in Figure 7.1. The BCD logic is defined in Table 7.1 using as an example a typical
instrument reading:
7890 1.2+3456
The first group of four digits is the bottle identification number; the second of six digits, the
display output.
The WRITE ENABLE pulse occurring every 250 milliseconds approximately appears on Pin 21.
The signal references are on Pins 29 and 30. Control outputs from the DATA LOG pushbutton
use Pins 31, 32 and 33 as follows:
Pushbutton not pressed - Pins 32 and 33 shorted
Pushbutton pressed - Pins 32 and 31 shorted
Pins 7, 9, 28 and 42 are not used (N.U.).
7.3. OPERATING PROCEDURE
(a) Enter bottle identification number on thumbwheel switch each time new sample is
installed.
(b) Press DATA LOG pushbutton momentarily when sample measurement is completed and
display indicates final reading.
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