Quatech DS-100 user manual Specifications, Baud Rates

8. Specifications

BAUD RATES:

DATA RATE			MAXIMUM LOAD (pF)
(kbaud)	4% TRAN	10% TRAN	15% TRAN	20% TRAN	25% TRAN
115.2	1000	2470	4300	5500	6600

NOTE 1: The signal transition time ratio is defined as the percentage of the unit interval or bit time (the inverse of the data rate) that is occupied by the signal transitioning from -3V to +3V. EIA/TIA-232-E defines a maximum signal transition time ratio of 4%; most RS-232 receivers will recognize signal transitions with much larger ratios. With a 4% signal transition time ratio, EIA/TIA-232-E is limited to a theoretical data rate of 200 kbaud. If maximum signal transition time ratio is extended to 10%, 15%, 20%, or even 25%, the maximum data rate achievable using EIA/TIA-232-E can be increased past 200 kbaud.

NOTE 2: A typical value for capacitance per foot of standard cable is 50 pF/ft.

UARTs: Two 16550 UARTs with 16-byte FIFOs

TRANSMIT DRIVERS: SN75150 or compatible

HIGH LEVEL OUTPUT: +5V min, +8V typical

LOW LEVEL OUTPUT: -5V max, -8V typical

SWITCHING SPEED, LOW-HIGH:	1.4 µs with 2500 pF load
SWITCHING SPEED, HIGH-LOW:	40 ns with 15 pF load
	1.5 µs with 2500 pF load
	20 ns with 15 pF load

RECEIVE BUFFERS: MC1489 or compatible

HIGH LEVEL OUTPUT: +3V to +13V

LOW LEVEL OUTPUT: -3V to -13V

SWITCHING SPEED: 120 ns typical, 175 ns max

BASE ADDRESS RANGE: 0000 hex to FFF8 hex

INTERRUPT OPTIONS: 2-7,10-12,14-15

CONNECTORS: Two DB-9 male connectors

SLOT REQUIREMENTS: One 16-bit ISA slot

DIMENSIONS: 7.050” x 3.900”
POWER REQUIREMENTS:	+5 volts	908 mA max
	+12 volts	66 mA max
7-1		Quatech Inc.