GC-1201S Two-master One-slave Isolated RS485 Hub Repeater Double Electrical Isolation Support for Modbus Protocol

GC-1201S Two-master One-slave Isolated RS485 Hub Repeater Double Electrical Isolation Support for Modbus Protocol

Description:
- GC-1201S two channel cache isolation RS485 Hub is a communication device that supports two RS485 master station devices and one or more RS485 slave station devices. It is used to solve the problem of communication conflicts caused by two master stations communicating with slave stations at the same time. When master station 1 queries slave station data, it will only return to master station 1 and not to master station 2; Querying data from master station 2 will only return to master station 2 and not to master station 1. The interface between the master station and the slave station adopts electrical isolation technology to protect the master station equipment from interference. The circuit design includes 15KV ESD protection and 5KA lightning surge protection devices, which can effectively isolate the harm caused by lightning strikes and static electricity to the equipment. Each of the three communication interfaces has a communication indicator light, which can visually display the status of each communication port. Transparent data transmission between the master and slave interfaces, communication format and baud rate can be set through software.
- This product is suitable for Modbus protocol, DLT-645 protocol, and other similar one-to-one master-slave protocols.

Features:
- The power input DC9-30V has overcurrent and reverse protection.
- Support communication between two RS485 master devices and one or more RS485 slave devices.
- Supports multiple communication protocols, with typical protocols being Modbus protocol and DLT645 protocol.
- The baud rates of the three 485 interfaces can be independently set.
- You can set the byte interval time.
- Dual electrical isolation, communication and power isolation between the master and slave interfaces.
- The signal interface has static electricity, lightning strike, and surge protection.
- Using a 32-bit MCU, the baud rate can reach up to 115200.
- The communication port of the slave station supports a maximum of 125 nodes.

Module Parameters:
- Model: GC-1201S (Cache type RS485 two master one slave, multi slave hub)
- Working voltage: DC9-30V
- Working current: ≤100mA
- Function overview: allow two master stations to collect data from one or more slave stations
- Communication protocol: The module supports transparent transmission of data, and all one-to-one protocols are supported
- Typical protocols: Modbus protocol, DLT645 protocol, and other master-slave protocols
- Number of sub stations: <=125 (30 address whitelist)
- Interface: 3 RS485 interfaces
- Product dimensions: 100 x 54 x 32mm (including both ends)
- Product weight: 75g (net weight); 100g (gross weight, including accessories and box)
- Operating environment: -40°C to 85°C, relative humidity 5% -95%

Communication Parameters:
- Communication type: Isolated RS-485 (isolation voltage 2500V)
- Baud rate: 1200-115200bps, default 9600 (8, n, 1)
- Communication distance: 1000 meters
- Other: Stop bit can be set, check bit can be set
- Protection level: RS-485 interface with 600W lightning surge protection per line, ±15KV ESD protection

Package Included:
- 1 x GC-1201S Module

Communication Speed:
- Firstly, it should be noted that communication speed is mainly related to baud rate and data length:
  The higher the baud rate, the shorter the data length, and the faster the communication speed; On the contrary, the slower the speed.
  In addition, it also depends on the response speed of the slave station. The faster the response speed of the slave station, the higher the overall communication speed.
- Using MODBUS protocol to read 11 registers at 9600 baud rate as an example:
  Upper computer query command
  01 03 00 00 00 0b 04 0d
  Lower computer response command
  01 03 16 00 d7 00 6f 00 63 00 42 00 37 00 60 00 23 00 4e 00 42 00 60 00 02 a8 d8
- As shown in the figure, according to the sampling image measured by the oscilloscope, (1) the entire communication process takes about 100ms; (2) Module forwarding (one receive, one send) takes approximately 38ms to complete.