Hardware Connectivity
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B&B ISO.RS232 TO RS485 DB9 DINRAIL - 1 x 9-pin DB-9 RS-232 Serial Female - 1 x Terminal Block RS-422/485 Serial - 1
Our industrial RS-232 to RS-422 and RS-485 converters are ideally suited for the automation market and other "control panel" applications. Terminal blocks are used to input the power and data signals. Most offer isolation and are hardened for use in areas exposed to temperature extremes. The EMC and emissions specifications run the gambit from light industrial EN 61000-6-1to heavy industrial EN 61000-6-2 with IEEE 1613. Each product also carries a UL listing or recognition. Check out the specs on each product and select the one best suited for your needs.
Learn More$178.65 -
B&B PT PWRD 9PIN 232/485 CONV W/SD - 1 x 9-pin DB-9 RS-232 Serial Female - 1 x 9-pin DB-9 RS-485 Serial Female - 1
These port-powered RS-232 to 422/485 converters change TD and RD RS-232 lines to 422/485 signals. All of our serial port converters feature Automatic Send Data Control. SDC automatically enables the RS-485 driver when data is present on the RS-232 side. Control of the driver is automatic at rates up to 115.2 kbps.
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B&B PT PWRD 9PIN 232/485 CONV W/SD - 1 x 9-pin DB-9 RS-232 Serial Female - 1 x RS-485 Terminal Block - 1
The 485SD9TB is a port-powered two-channel RS-232 to RS-485 converter. It converts the TD and RD RS-232 lines to balanced half-duplex RS-485 signals. The unit is powered from the RS-232 data and handshake lines whether the lines are high or low. An external power supply can be connected to two terminals on the RS-485 connector if no handshake lines are available. The 485SD9TB has a DB-9 female connector on the RS-232 side and a terminal block connector on the RS-485 side.
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B+B SmartWorx USB to RS-485 Mini-Converter - 1 x Type B USB 2.0 USB Female - 1 x 9-pin DB-9 RS-485 Serial Female
- Connect RS-485 Devices to your USB Port
- Perfect for Field Service Applications
- Small - Fits easily into any laptop bag
- USB Port Powered
- USB 2.0 (12 Mbps) Compatible
- RS-485 Data rates up to 921.6 Kbps
- Supports Windows 98, ME, 2000, XP, Vista & 7
$114.15 -
Advantech ULI-351DK - USB to RS-485 4 Wire (DB9 Female) Converter Locked Serial Number - 1 x DB-9 RS-485 Serial - Female - 1 x USB 2.0 Type B - Female
Advantech ULI-351DK - USB to RS-485 4 Wire (DB9 Female) Converter Locked Serial Number - 1 x DB-9 RS-485 Serial - Female - 1 x USB 2.0 Type B - Female Learn More$114.15 -
B+B SmartWorx RS-232 to RS-485 Converter with Pluggable Terminal Block - 1 x DB-9 RS-232 Serial - Female - 1 x Terminal Block RS-485 Serial
Model BB-485PTBR converts unbalanced RS-232 signals to balanced, full or half-duplex RS-485 signals. RS-485 is an enhanced version of the RS-422 Standard allowing multiple drivers and receivers on a two-wire system. The RS-232 port has a female DB9 connector with pins 2(RD), 3(TD), and 5(SG) supported. Pins 7(RTS) and 8(CTS) are tied together. Also pins 6(DSR), 1(CD), and 4(DTR) are tied together, but not passed through the converter. The RS-485 port has an 8-position pluggable terminal block connector.
Baud Rate
Model BB-485PTBR supports baud rates from 300 bps to 115.2 Kbps. In order to change the baud rate, a resistor and possibly a capacitor must be changed. By looking up the selected baud rate on Table 1 the resistor and capacitor value can be determined. Remove R3 and C7 from the printed circuit board. Place new components in the R2 and C6 locations.
Biasing Resistors
The biasing resistors R5 and R7 can also be altered. Model BB-485PTBR comes standard with 4.7K biasing resistors. To change the value of biasing resistors, remove R5 and R7 and replace with new value in locations R4 and R6.
Termination Resistor
The termination resistor is located at R8. A termination resistor can be placed in the R8 location and a jumper wire placed from the terminal location to RD(B). B+B SmartWorx recommends a 100-120 Ohm resistor for termination.
Constant Receiver Enable
The BB-485PTBR is factory-set with the receiver disabled during transmission. It can be set for constant receiver enable. When R9 is removed, the receiver is in constant receive mode (four-wire). When R9 is in the circuit it is in half-duplex mode (two-wire).
Data Line Polarity
The polarity of the two RS-485 lines must be correct. With no data being sent, the RS-232 line should be negative and the RS-485 "A" terminal should be negative with respect to the "B" terminal. If your equipment uses a "+" and "-" naming scheme, in most cases, the "A" line will be connected to the "-" and the "B" line will be connected to the "+".
Learn More$104.23
