Specifications

BAUD RATE SELECTION FOR THE ADC-16
Select the desired baud rate by placing the removable shunts in the positions which correspond to the desired baud
rate. All four of the shunts must be in place for the ADC-16 to operate properly.
CHANGING PROTOCOL SETTINGS
PARITY, WORD LENGTH and STOP BITS: These functions are selected using pins 35, 36, 37, 38 and 39 on the 40
pin UART IC on the ADC-16. Connect the pins to the (+) 5 volt or (-) ground power feed (located above and below
pins 35 thru 39) as shown in the chart on the following page to select the desired protocol. Be sure to cut the existing
circuit track using a knife (if different).
Page 8
PIN 39 (EPE) WLS1 WLS2 SBS (PINS 38, 37, 36) PIN 35 (PI)
0 = Odd Parity 0 0 0 (5 data bits, 1 stop bit) 0 = Parity On
1 = Even parity 0 0 1 (5 data bits, 1.5 stop bits) 1 = Parity Off
1 0 0 (6 data bits, 1 stop bit)
1 0 1 (6 data bits, 2 stop bits) NOTE: 1=(+5 VDC), 0=(ground (-))
0 1 0 (7 data bits, 1 stop bit) All pins must be connected to 5 volts or
0 1 1 (7 data bits, 2 stop bits) ground. Do not allow any pins to float
1 1 0 (8 data bits, 1 stop bit) (pins left unconnected).
1 1 1 (8 data bits, 2 stop bits)
RS-485 INTERFACING AND RS-232 DISTANCE LIMITATIONS
The RS-232 interface will allow the AR-16, ADC-4(8)(16) or STA-8(16) interface cards to be located up to 50 feet from
the computer using a single 3 conductor wire. When distances need to be greater, the RS-422, RS-423 and the RS-
422A, RS-485 interfaces will allow the Interface card to be located up to 4,000 feet from the computer using a 2 pair
communications cable (4 conductor/2 twisted pairs of wire or CAT5). Shielding of the communication cable/CAT5 is
recommended to protect against electrical storm EMI. The PS-4 or PS-8 port selector may be used to select one port
(1 of 4 or 1 of 8) to control up to 8 interface cards (ADC-16, STA-16 or AR-16) at various locations up to 4,000 feet
from the port selector, providing up to 256 analog inputs, up to 1,152 status inputs and providing control of up to
1,024 relays. A total of up to (16) PS-8 port selectors may be connected to a single RS-232 port, allowing for a total of
4,096 analog inputs, 18,432 status inputs and 16,384 relays.
Page 9
RS-232
Interface
50 feet
The PS-4 converts the computer RS-232
into (4) software selectable RS-485 ports
(also available in RS-422A/RS-422).
AR-16, ADC-4
ADC-8, ADC-16,
STA-8 or STA-16
RS-485 option
AR-16, ADC-4
ADC-8, ADC-16,
STA-8 or STA-16
RS-485 option
AR-16, ADC-4
ADC-8, ADC-16,
STA-8 or STA-16
RS-485 option
AR-16, ADC-4
ADC-8, ADC-16,
STA-8 or STA-16
RS-485 option
4,000 feet*
4,000 feet*
4,000 feet*
4,000 feet*
* Two twisted wire pairs
PS-4 PORT
SELECTOR
AR-16, ADC-4
ADC-8, ADC-16,
STA-8 or STA-16
AR-16, ADC-4
ADC-8, ADC-16,
STA-8 or STA-16
RS-232
Interface
50 feet
RS-485
Interface
4,000 feet
T R S - - +
ADC-16 Analog to Digital Card
(+)
(-)
RED WIRE
12V REGULATOR
YELLOW WIRE
WIRE
NUT
BLACK WIRE
POWER
SUPPLY
7812
BAUD RATE
BAUD RATE
50
75
110
134.5
150
300
600
1200
1800
2000
2400
3600
4800
7200
9600
19200
EXAMPLE SHOWS 9,600
BAUD SELECTED
40 38 39 37 36 35
40 PIN UART
Bottom View
(solder side)
(+)
(-)