9469200994 Rev — 27
DGC-2020ES Specifications
Maximum Wire Length ..................... 4,000 feet (1,219 meters)
Terminals.......................................... 11 (RDP TxD+), 10 (RDP TxD–)
CAN
Differential Bus Voltage .................... 1.5 to 3 Vdc
Maximum Voltage ............................ –32 to +32 Vdc with respect to negative battery terminal
Communication Rate ........................ 250 kb/s
Terminals.......................................... 14 (low), 13 (high), and 15 (shield)
Notes
1. If the DGC-2020ES is providing one end of the J1939 bus, a 120 ohm, ½
watt terminating resistor should be installed across terminals 14 (CANL)
and 13 (CANH).
2. If the DGC-2020ES is not providing one end of the J1939 bus, the stub
connecting the DGC-2020ES to the bus should not exceed 914 mm (3 ft)
in length.
3. The maximum bus length, not including stubs, is 40 m (131 ft).
4. The J1939 drain (shield) should be grounded at one point only. If
grounded elsewhere, do not connect the drain to the DGC-2020ES.
Real-Time Clock
Clock has leap year and selectable daylight saving time correction. Backup capacitor and backup battery
sustain timekeeping during losses of DGC-2020ES control power.
Resolution ........................................ 1 s
Accuracy........................................... ±1.73 s/d at 25°C
Clock Holdup
Capacitor Holdup Time .................... Up to 24 hours depending on conditions
Battery Holdup Time ........................ Approximately 10 years depending on conditions
Liquid Crystal Display (LCD)
Display ............................................ 128 by 64 dot pixels LCD with LED Backlight
Operating Temperature .................... –40 to +70°C (–40 to +158°F)
Storage Temperature ....................... –40 to +80°C (–40 to +176°F)
LCD Heater
The ambient temperature is monitored by a temperature sensor located near the LCD inside the DGC-
2020ES. The LCD heater turns on when the ambient temperature falls below 0°C (32°F). The heater turns
off when the ambient temperature rises above 5°C (41°F). This range of operation implements 5°C (9°F)
of hysteresis between when the heater turns on and turns off.
Type Tests
Shock and Vibration ......................... EN60068-2-6
Dielectric Strength ............................ IEC 255-5
Impulse ............................................ EN60664-1
Transients......................................... EN61000-4-4
Static Discharge ............................... EN61000-4-2