Radiant, Inc.
7
ALARM RELAY USAGE
The alarm relay contact information is on the NC, COM and NO connectors. NC is normally
closed when the power is "off" to the DVMD1. NO is normally open when power is "off" to the
DVMD1. Most users will need the NO and COM terminals. The NC terminal is brought out to
provide both options.
Most alarm systems need to OPEN when:
1. There is an alarm.
2. There is a power loss to the DVMD
3. There is a broken wire from the NO and COM wires to the host
The DVMD1 is designed to do all three functions using the NO and COM terminals.
When the power is "OFF" NO is OPEN
When there is an alarm NO is OPEN
When there is a broken wire NO "looks" OPEN.
HOST CONNECTOR
Serial communications to the Host Computer is via RS232 channel at 19,200 baud, 8 bits, no
parity, and two stop bits. Table 2 shows the Pin Connection and Functions for the Serial Port.
Pin 1 is on the right with the tab up.
RJ12 PIN
NUMBER
COLOR
FUNCTION
Pin 1
WHITE
RS232 Data Transmitted to PC
Pin 2
BLACK
Ground
Pin 3
RED
CHAIN RS485 Data -
Pin 4
GREEN
CHAIN RS485 Data +
Pin 5
YELLOW
Ground
Pin 6
BLUE
RS232 Data Received from PC
Table 2A – Host Port Pinout
The connections are made with an RJ12 connector crimped on a 6-wire phone cord. Purchase
Digikey H2442-25 for short runs up to 25 feet. Intermediate runs to 100 feet need:
1. Digikey part number A9118 (100 pcs of Amp’s crimp connector PN 5-555042-3)
2. Digikey part number H0063-100 specifies 100 feet of 6-conductor black phone cord.
3.
Digikey part number PAL1545.1 for an inexpensive crimp tool.
A modular adaptor is needed to connect the DVMD1 to a serial port on the HOST. Table 2 shows
the pinout of the DB9 connector. Purchase Digikey 046-0003 or LCOM REC096F or
Pan
Pacific makes the "ADM-9F6-GR",
carried by Fry’s/Outpost.com as 2402370
.
DB 9 PIN
NUMBER
Serial Adapter
Color
FUNCTION
Pin 2
White
RS232 Data Transmitted to PC
Pin 3
Blue
RS232 Data Received from PC
Pin 5
Black
Ground
Table 2B – DB9 Female Adapter Pinout
