Toa HF-250M Specifications

TOA INTERCOM SYSTEMS

DESK/SURFACE-MOUNTED

MASTER STATION

HF-250M

DESCRIPTION

The HF-250M desk/surface-mounted type master intercom
station is designed to operate together with a TOA fully
electronic microcomputer-controlled exchange equipped
with a memory for stored program control. The HF-250M
can communicate in full-duplex with all other master
stations in the system. It has a handset and an on-board
electret condenser mic. It is equipped with an auto-dialer
function that can connect a maximum of sixteen (16)
stations by one-touch dialing of a registered station

number. The HF-250M also has an LCD display to show

dialing data and current time. The DT-E70 data transmitting

unit is required for this display.

FEATURES

1. Desk-top or wall mounting.

2. Sixteen auto-dial keys.

3. 12-segment LCD shows calling station number, waiting
station number, and number of waiting stations, plus
current time. DT-E70 data transmitting unit is required
for all except calling station number display.

4. High/Low selectable speaker volume control.

5. External microphone or headset connection.

6. “Spill-proof” keypad.

7. Jack to connect 4-pin modular telephone plug.

8. Programming from keypad.

9. Two-pair twisted wire (22—24AWG).

SPECIFICATIONS APPEARANCE AND DIMENSIONAL DIAGRAM

Handset Microphone &

Speaker

Internal Speaker
Internal Microphone

Keypad
Speaker Volume Control
External Input
Display
Auto-Dialer
Station No. Registration

Capacity
Registration Code No.
Wiring

Power Requirements
Operating Temperature
Case Material & Color
Dimensions (W x H x D)

Weight

Dynamic type, 130-ohm each
Dynamic type, 8-ohm, 2.25" (57mm)

0.6 watts
Electret condenser type
“Spill-proof” key switch
High/Low selectable
External microphone or headset connectable
12-segment LCD

8 keys

Max. 16

Max. 50 digits
Twist 2 pairs, nonpolar (Desk mountable

via 4-pin modular telephone connector)
24V DC, 30mA

32°F to 104°F (0°C to 40°C)
ABS resins, pale white

8.5 x 2.5 x 8.2 inches
216 x 69.5 x 208mm

2.2 Ibs. (960g)

dia.,

8.5" (216mm)

ARCHITECT’S AND ENGINEER’S
SPECIFICATIONS

The master station shall be a TOA HF-250M and shall be capable of

full-duplex communication with other master stations via its dynamic
handset. The HF-250M shall be capable of hands-free communication

with other master stations via its on-board dynamic electret condenser

mic. An external mic or headset may be attached with the unit’s 1/4" jack.

The HF-250M shall be equipped with a 12-segment LCD display, a

modular (TELCO type) jack for standard four-pin connectors, 22-24
AWG wire and an 8-ohm dynamic speaker with volume switch. The
HF-250M shall include an auto-dialer which can connect a maximum
of sixteen (16) stations by one-touch dialing.

DT-E70

Power Supply
Current Consumption
Transmitting Channel 16 channels (Selection with DlP switch on

Numbers

Transmitting Unit
Transmitting Data per 512 bits (32 words)

Channel
Transmitting Cycle Time
Transmitting System
Transmitting Line Nonpolar 2-conductor cable

Output Impedance
Transmitting Distance
Parallel Connection DR-B61: Max. 50 units/DT-E70

Numbers

Time Entering Device HF-250M

Operating Temperature 32°F to 104°F (0°C to 40°C)
Installation Method

Color Panel: Metallic gold

Dimensions (W x H x D)
Weight

SPECIFICATIONS

+24V DC (20 to 28V)
200mA max.

PC board)
Max. 16 units per system

0.32 second/cycle

2-frequency FSK (frequency shift keying)
(parallel, stranded, shielded)

16-ohm/600-ohm balanced

Max. 1.24 miles (2km) [1/40" (0.65mm) dia.]
HF-250M: Max. 16 units/DT-E70

Desk top or rack mounting

Case: Colored steel plate—dark grey

(Munsell N3.0)

Rack mounting bracket: Metallic gold

17.0 (19.0) x 1.8 x 11.3 inches
432 (483) x 44.5 x 288mm

6.8 Ibs. (3.1 kg)

DT-E70
Data Transmitting Unit

The DT-E70 data transmitting unit is designed for use with
the EXES-6000 series exchange EX-600/610/620/630. This
unit enables various indication or control functions such as

In/Out announciations, calling party indication and general
purpose control in conjunction with the DR-B61 data
receiving unit and HF-250M intercom station with LCD
display.

* Specifications are subject to change without notice.

TOA Corporation

Printed in Japan (407) 833-63-027-40