Introduction

There are many RS-232 devices in industry applications. Nowadays it becomes important to link all those RS-232 devices together for automation & information. Usually those RS-232 devices are far away from the host-PC & widely distributed in the factory. So it is not a good idea to use multi-serial cards to connect all these RS-232 devices together. Our I-752x series products can be used to link multiple RS-232 devices by single RS-485 network. The RS-485 is famous for it’s easy maintenance, simple cabling, stable, reliable and low cost. When the user want to connect RS-232 devices to 10BASE T, our I-7188EN can meet this demand. Refer to I-7188EN literatures for further information.

Onboard 1K bytes Queue-buffer 

The I-752X equips 1K bytes queue-buffer for its local RS-232 device. So all input data can be stored in queue-buffer until the host-PC has time to read. These features will make the host-PC link thousands of RS-232 devices without lose any data. 

Onboard D/I for event trigger

The I-7521 and I-7522 equip three digital input channels, while I-7523 equips one digital input channel  for sensor interface. These D/I can be used to link with photo sensor/switch for event trigger. They also can be used as general purpose D/I. The 752X can read & analyze these D/I without the help of host-PC. 

Onboard D/O for emergency control

The I-7521 equips three digital output channels, while I-7522 equips one digital output channel for emergency control. The D/O can directly drive relay or led. They can be used to control the local devices for emergency event. The 752x can control these D/O without the help of host-PC. 

3000V isolation on RS-485 site

The COM2 of the I-752x is an isolated RS-485 port with 3000V isolation. This isolation will protect the local RS-232 devices from transient noises coming from RS-485 network. 

Self-Tuner ASIC inside

The I-752X equips a Self-Tuner ASIC for RS-485 port. This chip can auto detect and control the send/receive direction of the RS-485 network. Therefore the application programs don’t have to take care of the direction control of the RS-485 network. The advanced technology which makes this possible is covered by R.O.C. Patent 103060, 132457. 

Can used as Addressable RS-485 to RS-232 Converter

Most RS-232 devices don’t support device address. The I-752X series can assign a unique address to any RS-232 device installed in the RS-485 network. Host-PC can send command with device address to RS-485 network, the destination-752x will remove the address field & pass the other fields of command to its local RS-232 device. The response of this local RS-232 device will be passed to host-PC via this destionation-752x. 

Master-type Addressable RS-485 to RS-232 Converter

Basically our 752X products are Master-type converters. The 752X use our R.O.C. Patent 086674. Other competitor’s converter is Slave-type and can’t work stand alone without host-PC. In real industrial application, the demand is different case by case and customers are not satisfied with Slave-type. The 752x are very powerful and can analyze the local RS-232 device, D/I or D/O without host-PC. Refer to Application 5 to Application 9 for more information. 

Can be used as an Embedded Controller

Besides Intelligent Communication Controller, the I-752X series products can be used as an embedded controller. Every I-752X controller has an, MiniOS7, embedded O.S.  . The MiniOS7 provides equivalent functions of ROM DOS and has more features. The user can use well-developed libraries and demo programs to implement his controller. 

Can be used as RS-485 to RS-232 Device Server

The Device Server is an appliance that network enables any device with a serial communication port. Our Intelligent Communication Controllers allow those devices to become connected to the RS-485 network If the user want to use Ethernet work, he can choose I-7188EN series products. 

Features

The COM 1 of the I-7521, I-7522, I-7523, I-7524 and I-7527can be used as RS-232 port or RS-485 port

The COM1 can be used to download program. 

Built-in “Addressable RS-485 to RS-232 Converter” firmware 

Support about 30 well-defined commands 

Support Dual-Watchdog commands 

Support Power-up value & safe value for D/O 

The source code of firmware is open & well-document 

User can modify the source code according to his special requirement. 

The firmware can real-time monitor the onboard D/I and control the onboard D/O according to user’s requirement 

The firmware can real-time monitor the RS-232 device and control the onboard D/O according to user’s requirement 

7521 support one RS-232 device 

7522 support two RS-232 devices 

7523 support three RS-232 devices 

7524 support four RS-232 devices 

7527 support seven RS-232 devices 

Watchdog timer provides fault tolerance and recovery 

Low power consumption 

R.O.C. Invention Patent No. 086674, No.103060, No. 132457

Specifications

CPU: 80188 

20M Hz; for I-7521/7522/7523

40M Hz; for I-7524/7527 

SRAM:

128K bytes for I-7521/7522/7523

256K bytes for I-7524/7527

Flash ROM:

256K bytes for I-7521/7522/7523

512K bytes for I-7522A/7523/7524/7527

EEPROM: 2048 bytes

Communication speed: 115.2K BPS max.

RS-232 interface connector: Male DB-9

RS-485 interface connector for I-7521/7522/7523: 13-pin screw terminal block ( accepts 16~26 AWG wires ); 3.81mm pitch 

RS-485 interface connector for I-7524/7527: 14-pin screw terminal block ( accepts 16~22 AWG wires ); 3.5mm pitch 

D/I:3.5V~30V 

D/O: 100mA/30V 

Accessories:One download cable, one mini screw driver 

Operating temperature: -25℃to +75℃

Storage temperature:-40℃to +80℃

Command Sets

Note3:RS-485 ( D2+, D2- ; self-tuner inside); 

3000V isolation 

Note4: RS-232 (TXD, RXD, RTS, CTS  )

Note5: RS-232 ( TXD, RXD )

Dimensions: 123mm x 72mm x 33mm

Power requirement: Unregulated 10~30 VDC with protection from power reversals 

Power consumption: 

2W (without display) 

3W (with display)

Applications

Factory Automation 

Building Automation 

Home Automation