2
3.2 BCD OUTPUTS
The board is factory-set as 6-digit parallel BCD. Outputs are enabled when the
binary address on the instrument select lines, pins L24, U24, L23, and U23, match
the board address (set by pin group S1). The output polarity is normally positive
true (reversible by S4) and each output can drive 10 LSTTL loads.
(N/C) ALARM LOW L1 U1 ALARM HIGH (N/C)
(N/C) N/C 2 2 ALARM GO (N/C)
(N/C) N/C 3 3 N/C (N/C)
(N/C) N/C 4 4 N/C (N/C)
(N/C) BCD 400 k 5 5 BCD 800 k (N/C)
(N/C) BCD 100 k 6 6 BCD 200 k (N/C)
(ISO GND) ISO GND 7 7 N/C (N/C)
(N/C) BCD 40 k 8 8 BCD 80 k (N/C)
(N/C) BCD 10 k 9 9 BCD 20 k (N/C)
(N/C) BCD 4 k 10 10 BCD 8 k (N/C)
(N/C) BCD 1 k 11 11 BCD 2 k (N/C)
(ALARM HIGH) D P 2 12 12 D P 4 (ALARM LOW)
(BCD 400 k) BCD 400 13 13 BCD 800 (BCD 800 k)
(BCD 100 k) BCD 100 14 14 BCD 200 (BCD 200 k)
(BCD 40 k) BCD 40 15 15 BCD 80 (BCD 80 k)
(BCD 10 k) BCD 10 16 16 BCD 20 (BCD 20 k)
(BCD 4 k) BCD 4 17 17 BCD 8 (BCD 8 k)
(BCD 1 k) BCD 1 18 18 BCD 2 (BCD 2 k)
(ISO GND) ISO GND 19 19 D P 1 (OVERFLOW)
(DATA READY) DATA READY 20 20 POLARITY (ALARM GO)
*ISO V+, 4 5 TO 5 5 V 21 21 *HOLD (HOLD)
(N/C) N/C 22 2 2 OVERFLOW (N/C)
*BOARD ADDR B4 23 23 *BOARD ADDR B8
*(BCD 1-800 ENABLE) BD ADDR B1 24 24 *BD ADDR B2(BCD 1-800k ENABLE)
(N/C) N/C L25 U25 N/C (N/C)
( ) Output in addressable 3-digit-at-a-time mode
* An input
N/C No internal connection
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