Name: Trycom TRP-C29U ModBus Interface
Brand: Trycom Technology Co Ltd
SKU: TRP-C29U
Price: 247.95 EUR
Availability: InStock

Trycom Technology Co Ltd

More about Trycom Technology Co Ltd

Trycom Technology is a Taiwanese company specializing in electronic design and manufacturing services. They offer a wide range of products including embedded systems, industrial computers, and IoT solutions. With a focus on innovation and quality, Trycom provides customized solutions for various industries, leveraging their expertise in hardware and software integration to meet diverse client needs.

Trycom interfaces: USB, Ethernet and Modbus links to RS-485 I/O

Trycom Technology (Taiwan) makes industrial serial and network interfaces: USB to RS-232/422/485 converters, isolated repeaters, Ethernet serial servers, fibre converters and RS-485 remote I/O modules. Together they let a PC, PLC or SCADA system reach serial field devices over USB, Ethernet or fibre, with galvanic isolation between the host and the field wiring. Most modules share one 151 x 75 x 26 mm housing that mounts on DIN rail or a panel.

How a Trycom RS-485 network is built

A Trycom RS-485 network is a master, a converter and a chain of addressed modules on one twisted pair. The master is a PC or SCADA package running Modbus RTU or the Trycom ASCII protocol. A USB converter such as the TRP-C08S (one RS-232 port and one RS-422/485 port, 3000 V DC isolation on the RS-422/485 side) connects it to the bus. Remote I/O modules such as the TRP-C24, TRP-C26 and TRP-C28 each take their own address and answer the master one at a time.

One master, one converter, many addressed modules on a single bus, terminated at both ends.

RS-485 multi-drop: addresses, termination and distance

RS-485 is a two-wire differential bus that supports many devices on one cable, at up to about 1200 m. The standard supports at least 32 unit loads per segment, recommends a daisy-chain layout rather than a star, and calls for a termination resistor at each end of the cable, typically 120 ohms for twisted pair. In Modbus RTU each slave needs a unique address from 1 to 247, the range given in the TRP-C28 manual. The TRP-C07 optically isolated repeater adds isolation and range at a point in the run. Maximum distance varies by module, so check the manual for the one you fit.

Modbus TCP to RTU: bringing serial devices onto Ethernet

A Modbus TCP to RTU gateway lets an Ethernet SCADA system poll serial Modbus devices as if they were on the network. The TRP-C37M converts between Modbus TCP and Modbus RTU/ASCII in both directions (TCP master to serial slave, and serial master to TCP slave). In a typical gateway the TCP unit identifier selects the RTU slave address and the gateway adds or strips the RTU CRC, so the function codes and data pass through unchanged. Check the TRP-C37M manual for its own unit-ID options.

The gateway turns one Ethernet connection into a Modbus RTU master for the serial slaves.

Trycom interfaces at a glance

Model	Type	Interfaces	Key specification
TRP-C08S	USB serial converter	USB 2.0 to 1 RS-232 and 1 RS-422/485	3000 V DC isolation on RS-422/485; USB powered; 75 bps to 256 kbps
TRP-C08M	Multi-port USB converter	USB 2.0 to 4 ports, RS-232/422/485	3 kV isolation
TRP-C08X	Multi-port USB converter	USB to 4 serial ports	See product page
TRP-C06	Isolated serial converter	RS-232C to RS-422/485	See product page
TRP-C07	Isolated repeater	RS-422/485 to RS-422/485	3000 V DC isolation; auto baud rate 300 bps to 115.2 kbps; 1200 m
TRP-C24	Remote I/O	RS-485; 16 open-collector outputs	ASCII and Modbus RTU; 100 mA per output
TRP-C26	Remote I/O	RS-485; 16 digital inputs with counter	ASCII and Modbus RTU; 0 to 30 V DC inputs; 3750 Vrms input isolation
TRP-C28	Remote I/O	RS-485; 4 inputs, 4 relays	ASCII and Modbus RTU; relays 5 A at 30 V DC or 250 V AC; 3750 Vrms input isolation
TRP-C29	Remote I/O	RS-485; 8 inputs, 8 open-collector outputs	ASCII and Modbus RTU
TRP-C68	Remote analogue I/O	RS-485; 8 channels	See product page
TRP-C26H	Modbus TCP I/O	Ethernet RJ45; 16 digital inputs with counter	16 TCP connections at once; 3750 Vrms input isolation
TRP-C28H	Modbus TCP I/O	Ethernet RJ45; 4 inputs, 4 relays	16 TCP connections at once; 3750 Vrms input isolation
TRP-C24H	Modbus TCP I/O	Ethernet RJ45; 16 digital outputs	See product page
TRP-C37	Ethernet serial server	Ethernet to RS-232/422/485	Surge protection and watchdog on the serial side; see product page
TRP-C37M	Modbus TCP to RTU/ASCII gateway	10/100 Ethernet to RS-232/422/485 (auto switching)	Direct IP, Virtual COM and Paired modes; up to 16 connections; 10 to 30 V DC
TRP-C39	Fibre converter	ST multi-mode fibre to RS-232/422/485	Fibre up to 2 km; 3000 V DC isolation
TRP-C39S	Fibre converter	SC single-mode fibre to RS-232/422/485	Fibre up to 40 km; 3000 V DC isolation
TRP-C41	Media converter	Ethernet to fibre	Up to 20 km

Also stocked: the TRP-C08-V30, TRP-C08H and TRP-C08U USB to RS-232C converters, the TRP-C06H dual RS-232C to RS-422/485 converter, the TRP-C29U and the TRP-C51B Bluetooth interface. Check the product page for their ratings.

Standards, isolation and key specifications

Serial standards: RS-232, RS-422 (four-wire differential, full duplex) and RS-485 (two-wire differential, half duplex). The TRP-C37M and the fibre converters switch between the three automatically.
Isolation: the converters, repeater and fibre units are rated at 3000 V DC. The digital inputs on the TRP-C26, TRP-C28 and their Ethernet versions are optically isolated at 3750 Vrms.
Protection: Trycom lists surge protection on the RS-422/485 data lines of its converters and gateway, and +/-15 kV ESD protection on the TRP-C08S.
Protocols: the RS-485 I/O modules speak Trycom ASCII and Modbus RTU; the TRP-C28 selects between them with a DIP switch. The Ethernet versions add Modbus TCP.
Power: USB converters take power from the USB port. The TRP-C07, TRP-C24, TRP-C26 and TRP-C37M run from 10 to 30 V DC.
Mounting: DIN rail or panel. The T-SNAP DIN rail bracket is available for the 151 x 75 x 26 mm units.

Software and cabling

USB drivers: Trycom lists support for Windows, Linux, Mac OS and Android on its USB converters; check the version list for your model.
Ethernet units: the TRP-C37M is configured through the Trycom Device Manager utility or its built-in web page, and its firmware can be updated over the LAN.
Cables: the LI-RS232-9M9F RS-232C cable, the LI-RS232-9F9F null modem cable and a 1.8 m USB 2.0 A to B cable.

Typical applications

Connecting a laptop or PC to RS-485 instruments and PLCs through a TRP-C08S
Remote switching and monitoring on a multi-drop RS-485 line with the TRP-C24, TRP-C26 and TRP-C28
Breaking ground loops between buildings or plant areas with the TRP-C07 isolated repeater
Bringing serial Modbus devices into a SCADA system over Ethernet with the TRP-C37M
Long serial runs over fibre with the TRP-C39 (2 km) or TRP-C39S (40 km)

Frequently asked questions

How do I connect a PC to an RS-485 network?

Use a USB converter with an RS-485 port. The TRP-C08S has one RS-232 and one RS-422/485 port with 3000 V DC isolation, and the TRP-C08M gives four ports. Wire D+ and D- as a twisted pair to the bus.

How many devices can share one RS-485 bus?

The RS-485 standard supports at least 32 unit loads per segment over up to about 1200 m. Modbus RTU addresses run from 1 to 247. For more devices or a longer run, split the bus with a repeater such as the TRP-C07.

Do I need termination resistors?

Yes on a long or fast RS-485 bus. Fit one resistor at each end of the cable, typically 120 ohms for twisted pair, and none on the spurs in between.

Which protocols do the Trycom I/O modules use?

The RS-485 modules such as the TRP-C26 and TRP-C28 support Trycom ASCII and Modbus RTU. The TRP-C26H and TRP-C28H put the same I/O on Ethernet with Modbus TCP.

What is the difference between the TRP-C37 and TRP-C37M?

The TRP-C37 is an Ethernet serial server. The TRP-C37M is the Modbus version: it converts Modbus TCP to Modbus RTU/ASCII and back, and also offers Direct IP, Virtual COM and Paired modes.

Can Trycom interfaces be DIN-rail mounted?

Yes. Trycom lists DIN rail or panel mounting for the 151 x 75 x 26 mm units, with the T-SNAP DIN rail bracket available. The USB converters list DIN rail as an option, so check your model.

Source: Trycom Technology product documentation. Need help choosing a model? Ask our engineers.

Trycom TRP-C29U ModBus Interface

Trycom TRP-C29U ModBus Interface

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Trycom Technology Co Ltd

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Trycom LI-RS232-9F9F Null Modem Cable

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Trycom 1.8m USB 2.0 A to B cable

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