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CQ485 - RS485 / 422 repeater and isolator
Easy setup software included. Configuration via USB interface.
CQ485 is an RS485 and RS422 repeater, converter and isolator in one device. Both sides are galvanically isolated. Communication speed up to 921.6 kBd.
Where is this Isolator / Repeater needed?
Lines RS485 and RS422 are used in or at Industry. Although Those lines are very rugged and can run as far as 1200m, sometimes you need a repeater or an insulator. When? Let us see:
If you want to run Further than 1200m.
In case you use rigid connection (line is not connected as a bus), you need to isolate far points of the star.
When the device is not galvanic isolated from the power supply (against ground loops).
Communication interfaces
CQ485 Has Two communication interfaces - each Of Those can be configured as RS485, RS422 or RS422 multimaster. Both interfaces are completely isolated from eachother. According to setup you can have RS485 or RS422 isolator / repeater. Or you can convert RS485 to RS422 and vice versa while isolating Those two. RS422 multimaster is ook beschikbaar.
Features
- Complete galvanic isolation (including the GND) of both lines from each other and from power circuitry
- Second galvanic isolation of both lines from power GND (optional)
- Complete signal reconstruction (depending on the mode)
- The RS485 / 422 line (including the grounding) is completely isolated from USB and from the power supply (this isolation is provided as standard for all types)
- Optionally, second galvanic isolation of both lines from the power supply ground.
- Transmission speed up to 921.6 kBd
- Enhanced overvoltage protection for both lines.
- Automatic direction control with no delay.
- Wide range of the power voltage
- Easy setting using oversupplied software (or via terminal) on a USB interface (new).
- Easy installation.
- Adjustable-including termination resistors defining the idle state of the line.
- All signals connected via a slip-on terminal.
- Rugged metal enclosure with optional DIN rail holder
Transmission modes.
CQ485 module can work in three thesis data transmission modes:
- Passive mode: Data are shaped by TTL circuits; converter does not introduce any delay to the signal. Passive data ttransmission. Corrects edges of signals - no noticable delay is added the the transmission. (yellow - date, light blue - data out)
- Passive mode with timing: This mode is Suitable for special communication lines as CC-Link from Mitsubishi, or in special types or MODBUS RTU where there is need to separate individual packets. CQ485 inserts a delay or set-up length behind last stop bit. During this time CQ485 holds the line for itself. This mode works very similar to the passive mode. The Addition is in setting delay after receiving stop bit. Following example shows converter with 400μs delay. (yellow - date, light blue - data out). This mode works very similar to the passive mode. The Addition is in setting delay after receiving stop bit.
- Active mode: Data are received by a processor where and TRANSMITTED Those are completely reconstructed. The delay coming from That process is one byte.
CQ485 configuration
Most of the parameters (besides termination and idle-state-defining resistors) are adjustable via USB interface on the side of CQ485 module. To do that, you can use added software or any terminal program (for example HyperTerminal-which is contained in OS Windows.
