Heath Consultants Heath Data Recorder (HDR) - Manual (Page 10)

10
Internal Modem
The HDR may be equipped with an internal modem and phone line surge suppressor. The modem is pre-configured and
pre-wired from the factory, ready for remote communication. If the HDR is equipped with the phone line suppressor, it
will be connected directly into the modem’s RJ-11 connector. A 12-volt battery pack (8 “AA” batteries) is supplied, but
not connected when shipped. The user must connect prior to remote communication. Assuming one two-minute call per
day, every day, the battery should provide approximately 2 years of service.
To connect a phone line to the modem, insert the phone cable through the wire gland into the case (see Figure 1). The
cable must be terminated with a RJ-11 connector. Plug into surge protector if provided; else plug directly to the modem.
The optional phone line surge suppressor will sacrifice itself to protect the equipment in the event of a destructive power
surge on the phone line.
Caution: Unit must be connected to proper ground to allow the surge suppressor to operate properly.
Caution : Internal modem option is not currently certified for use in hazardous environments. An external modem should
be used when necessary. Refer to drawing MTM-308-1 for field wiring requirements on external power and modem
connections to maintain intrinsic safety.
Internal Modem Wiring (with “Call out upon Alarm”)
CTS RT
S
CD TXM RX
M
GN
D
GND
INDEX B
STOBE
INDEX A
STOBE
3V SYS
GND
GAS TEMP 2
1.5VDC
GND
12VDC
GND
BUTTON
JP5
CR2032
3V
1 2 3
ASSY#: 77R65-9320
REV F
3.6V "AA" Lithium
OPEN
JP1*
DISPLAY
BACKUP BATTERY
WIRED TO
*Jumper wire
Yellow (CTS)
Red (GND)
Gray (RXM)
Blue (TXM)
Heath 2400
Baud Modem
(Wake-up wire for "Call Out Upon Alarm")
12V
Modem
Bat
ter
y
(Wake-up wire for "Call Out Upon Alarm")
J13
P
h
o
n
e
Line
P
h
o
n
e
Line
Surge
Protector
(Optional)
Connect the RX, TX, GND & CTS wires from the HDR to the modem using the modem harness required (contact
Heath Consultants Inc for this harness). Plug in the jumper wire to JP5.
Note 1:
For “Call out upon alarm” feature. The modem harness connects Pin 2 of JP5 to Pin 6 of J13 (Modems
that stay online 100% doesn’t require this jumper).
Note 2: If the “Analog Modem” is NOT selected, the calls will be dialed 2 minutes apart. However, if the “Analog
Modem” is checked, the calls will be completed ASAP (Approximately 20 seconds).
Note 3: A “Manual” alarm must be reset in order to get a second “Call out” alert. An “Auto” alarm will call out
multiple times if the trip points are exceeded in succession.