Advantech BB-485CARLP9A
RS-232 to RS-485 Carrier HVAC Converter - Automatic Send Data Control
- Connect your laptop PC to Carrier branded HVAC equipment
- Extend RS-232 data signals up to 1.2 km (4,000 ft.)
- Change RS-232 TD and RD to RS-485 signals
- Automatic Send Data Control - no software drivers necessary
- Baud rates up to 115.2 kbps
- Powered from RS-232 handshake lines - no power supply required
Model 485CARLP9A is an RS-232 to RS-485 converter that allows you to connect your laptop PC to Carrier branded HVAC equipment.
Model 485CARLP9A is a port-powered, half-duplex RS-232 to RS-485 converter with send data control. The unit converts TD and RD RS-232 lines to balanced RS-485 signals and supports three-wire (Data A, B, and Signal Ground reference) RS-485 communications only.
The converter is powered from the RS-232 handshake lines, RTS, CTS and DTR, DSR, CD. The handshake lines are looped back on each other and can be in either state. No handshake change is necessary – no software is required to control the lines.
The RS-485 driver is enabled with each bit of data. The RS-485 receiver is disabled when the driver is enabled and enabled when the driver is disabled. This prevents data from being echoed back into the RS-232 device. The RS-232 side has a DB-9 female connector. The RS-485 side has a six-position RJ11 connector.
CONNECTIONS
Regardless of the system, Model 485CARLP9A must be connected with the proper polarity (Pin-Out Assignment table). Regardless of the system, the 485CARLP9A must be connected with the proper polarity. With no data being sent and the driver enabled, the RS-232 line should be negative and the Data(A) should be negative with respect to Data(B).
Proper operation of any RS-485 system requires the presence of a signal return path between the signal grounds of the equipment at each end of an interconnection. This circuit reference may be established by a third conductor connecting the common leads of devices, or it may be provided by connections in each equipment to an earth reference. When the circuit reference is provided by a third conductor, the connection between the signal grounds and the third conductor should contain some resistance (e.g. 100 Ohms) to limit circulating currents when other ground connections are provided for safety.
NOTE: This converter is not optically isolated.
Model 485CARLP9A is a port-powered, half-duplex RS-232 to RS-485 converter with send data control. The unit converts TD and RD RS-232 lines to balanced RS-485 signals and supports three-wire (Data A, B, and Signal Ground reference) RS-485 communications only.
The converter is powered from the RS-232 handshake lines, RTS, CTS and DTR, DSR, CD. The handshake lines are looped back on each other and can be in either state. No handshake change is necessary – no software is required to control the lines.
The RS-485 driver is enabled with each bit of data. The RS-485 receiver is disabled when the driver is enabled and enabled when the driver is disabled. This prevents data from being echoed back into the RS-232 device. The RS-232 side has a DB-9 female connector. The RS-485 side has a six-position RJ11 connector.
CONNECTIONS
Regardless of the system, Model 485CARLP9A must be connected with the proper polarity (Pin-Out Assignment table). Regardless of the system, the 485CARLP9A must be connected with the proper polarity. With no data being sent and the driver enabled, the RS-232 line should be negative and the Data(A) should be negative with respect to Data(B).
Proper operation of any RS-485 system requires the presence of a signal return path between the signal grounds of the equipment at each end of an interconnection. This circuit reference may be established by a third conductor connecting the common leads of devices, or it may be provided by connections in each equipment to an earth reference. When the circuit reference is provided by a third conductor, the connection between the signal grounds and the third conductor should contain some resistance (e.g. 100 Ohms) to limit circulating currents when other ground connections are provided for safety.
NOTE: This converter is not optically isolated.
SPECIFICATIONS
SERIAL TECHNOLOGY | |
Communication | Two-wire with Signal Ground reference |
Data Rate | 115.2 kbps maximum |
RS-232 Connector | DB9 female |
RS-485 Connector | RJ11 |
Biasing Resistors | 4.7k Ohms |
POWER | |
Source | Port-powered from RS-232 handshake lines |
Power Consumption | 40mA maximum |
MECHANICAL | |
Dimensions | 7.6 x 3.3 x 2.9 cm (3.0 x 1.3 x 0.9 in) |
Enclosure | Plastic |
Weight | 0.18 lbs (81.6 g) |
ENVIRONMENTAL | |
Operating Temperature | 0 to +70 °C (+32 to +158 °F) |
Storage Temperature | -40 to +85 °C (-40 to +185 °F) |
Operating Humidity | 0 to 95% non-condensing |
APPROVALS / CERTIFICATIONS | |
FCC Part 15, CISPR, EN 55022 + AC:2011 Class B Emissions | |
CE | |
2004/108/EC | Electromagnetic Compatibility Directive |
2011/65/EU | Reduction of Hazardous Substances Directive |
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