TD-23 LV/HV - Industrial Networking Solutions – Industrial Ethernet Switches and Routers




The TD-23 is a simple industrial modem designed to allow cost effective and easy multidrop access (max 16 drops) to legacy serial industrial equipment. Any asynchronous word format can be used from either RS-232 or RS-485 protocols.

Designed with industrial locations in mind the modem can operate in extremes of temperature and electromagnetic field. The complete galvanic separation of all interfaces ensures earth loops and transients do not interfere with communication. There is both a low voltage and high voltage power version available.

The modem is specifically designed for legacy V.23 systems at 300 to 1200 bit/s and can be used either for multidrop applications or as a driver for a “push to talk” VHF radio system (relay version). The unit’s transmitter can be controlled by hardware handshaking, but can also use the auto turning time functionality built in.

All options are configurable by DIP switch meaning that no laptop is needed for configuration. Communication can be tuned for optimum performance by increase or reducing both receiver sensitivity and transmit power. A DCD and RXD filter also helps to improve performance with some older protocols.


• Power
Operating voltage LV : 10 to 60 VDC 10 to 30 VDC
HV : 48 to 300 VDC, 85.5 to 264 VDC
Rated current LV:
125 mA @ 12 VDC,
50 mA @ 24 VDC,
28 mA @ 48 VDC,
125 mA @ 12 VAC,
50 mA @ 24 VAC,
25 mA @ 32 VACHV:
10 mA @ 110 VDC,
7 mA @ 250 VDC,
20 mA @ 95 VDC,
15 mA @ 240 VAC
• Interfaces
RS-422/485 1 x 300 bit/s to 1200 bit/s
RS-232 1 x 300 bit/s to 1200 bit/s
Relay (optional) 1 x Detachabel screw terminal
Leased line 1 x 300 bit/s to 1200 bit/s
• Temperature
Operating –25 to +70°C (–13 to +158°F)
Storage and transport –30 to +70°C (–22 to +158°F)
• EMC specification
EN 55024 Immunity IT equipment
EN 61000-6-2 Immunity industrial environments
EN 61000-6-3 Emssion residental environments
EN 61000-6-4 Emission for industrial environments
FCC Part 15 Class B
EN 50121-4 Railway signalling and telecommunications apparatus
IEC 62236-4 Railway signalling and telecommunications apparatus
• Safety
Safety EN 60950-1, IT equipment
• Enclosure
Dimension (W x H x D) 55 X 100 X 132 mm (2.16 x 3.93 x 5.19 in)
Weight 0.25 kg
Degree of protection IP20

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