Digi JACKRABBIT BL1800 - Manual (Page 78)

74 Jackrabbit (BL1800)
B.3.1 Demonstration Board
A relay, a thermistor, four additional LEDs, and a serial cable are included in a bag of parts
to further allow exploration of the Jackrabbit‘s operation.
The SPDT relay handles 120 V at 5 A with a 12 V activating coil. The layout to accept this
relay is included on the top side of the Prototyping Board. Note that the relay coil connec-
tions need to be wired to one of the sinking high-power outputs (HV0–HV2) of the Jackrabbit.
Install the relay on the bottom side of the Prototyping Board, as shown in Figure B-4.
Figure B-4. Installation of Relay on Prototyping Board
NOTE: COIL(+) must be connected to a 12 V power supply when using the relay.
This is the nominal voltage supplied as +RAW when the transformer supplied with the
Development Kit is used, and in this case you may connect COIL(+) to +RAW. If you
use another power supply, connect COIL(+) to +12 V if +RAW is different.
NOTE: If you do use the transformer supplied with the Development Kit for COIL(+),
be aware that its voltage may be as high as 16 V at low current draws. This needs to be
taken into consideration if you plan to use a 12 V relay in critical applications.
Relay Contacts
[0.156" (4 mm) spacing]
[COIL(+) and COIL(-) spacing
is 0.1" (2.5 mm)]
PC2 PC0 TXB RXB VCC
RXC TXC PC1 PC3 GND
TXC
RXC
J1
RXB
TXB
GND
J7
GND PA
6
PA
4
PA
2
PA
0
PA
5
PA
3
PA
1
PA
7
J3
VCC
JP1
DS1 DS2 DS3 DS4 DS5 DS6 DS7 DS8 S1 S2 S3 S4 GND
GND PB5 PB4 PB3 PB2 PA
7
PA
6
PA
5
PA
4
PA
3
PA
2
PA
1
PA
0
GND PE2 PE4 PE6 PE0 HV0 HV2 K GND WDO PB6 PB4 PB2 PB0 GND
VCC
+RA
W
HV3 HV1 GND PE1 PE3 PE5 PE7 PCLK PB7 PB5 PB3 PB1 GND
BZR VCC K AD0 PD0
PE4 POT
+RAW
HV0
COIL(-) COIL(+)
JP2
N.C. COM N.O.
/RST GND IOBEN SM0 VCC 485- GND PD6 PD4 PD2 DA0 AD0 PC6 PC4 PD0
PC5 PC7
AGND
DA1 PD1 PD3 PD5 PD7 GND 485+
VCC SM1 S
TAT
VBA
T
GND
9
5
6
1 J4
Bottom Side
Relay
Connect:
+12 V to COIL(+)
HVx to COIL(-)
K to +RAW