Pub. 42004-455B
Model 352-101, 352-102, 352-103, & 352-104 Div. 1 SMART Hazardous Area Telephones Page 10 of 17
f:\standard ioms - current release\42004 instr. manuals\42004-455b.doc
02/13
PCBA Hardware Configuration
The PCBA hardware configuration options are explained in detail in the following sections and the
necessary jumper settings are identified to enable or disable each option. We recommend reading the
following sections, recording the desired parameters, and then making the necessary changes. We also
recommend that you make a record of your settings. The following options are controlled by specific
hardware configurations. See Figure 7 on page 8 for the jumper locations.
Auto-answer Configuration
Factory Setting
: Auto-answer feature enabled
The Auto-answer feature enables or disables the automatic answering of an incoming call, which allows
TMA to monitor the health of this telephone via polling. When the Auto-answer feature is enabled, the
telephone automatically answers the call and attempts to communicate with TMA.
Enable
: Place the J14 jumper in position
EN
.
Disable
: Place the J14 jumper in position
DIS
. (Do not use this setting except under the direction of
GAI-Tronics personnel.)
N
OTE
:
The Auto-answer feature must be enabled during remote programming, and to allow the
GAI-Tronics Telephone Management Application PC to contact the telephone.
Polarity Configuration
Factory Setting
: Non-polarity sensitive
This telephone can be configured to be polarity or non-polarity sensitive. With the non-polarized setting,
the telephone operates with the telephone line’s positive terminal connected to either the tip or the ring.
With the polarized setting, the telephone only operates with the telephone line’s positive terminal
connected to the tip.
Non-polarity Sensitive
: Place the J6 jumper in position
NON
.
Polarity Sensitive
: Place the J6 jumper in position
POL
.
DTMF Gain Select Configuration
Factory Setting
: Low Gain selected
Two gain selections are available in the DTMF detection circuit. In most installations, the low gain
setting is recommended. The high gain setting may be necessary if the telephone is not responding to
manual or TMA-generated DTMF commands.
Low Gain Selected
: Place the J17 jumper in position
LO
.
High Gain Selected
: Place the J17 jumper in position
HI
.
Low-Power Mode Configuration
Factory Setting
: Low-Power Mode Disabled
For some installations in which only minimal loop current is available, the performance of the telephone
may be improved by enabling this feature. Symptoms of minimal loop current may include low speaker
volume and/or momentary muting of audio. In the majority of applications, however, the low-power
mode should be disabled. The low-power mode is enabled by installing the following three jumpers: J21,
J22, and J23.
Low-Power Mode Enabled
: Jumpers installed at J21, J22, and J23.
Low-Power Mode Disabled
: Jumpers NOT installed at J21, J22, and J23.
