Thus 4 data transfer pins are used by RS485. Thus RS232 has two data transfer pins.īut RS485 uses a bipolar strategy where a set of positive and negative pins are used to transmit and receive signals. RS232 uses unbalanced signaling by which only one pin is used for transmission and reception. Similar: VGA Pinout, Features, Advantages & Disadvantages Signaling But RS484 has cross-over connections in its wiring. Note: The winding fashion of RS232 is a straight-through connection. The pinout of the male RS232 connectors is shown below. RS232 protocol uses a 9-pin DB9 connector. That is, a system can be connected with only one peripheral at once using RS232. RS232 supports a point-to-point connection where it can connect with only one device at-a-time. These features created numerous applications for RS485. It can connect and talk with up to 32 devices. RS485 can connect with multiple devices at-a-time. This makes RS232 a bi-directional interface and RS485 a uni-directional interface. RS232 transmits and receives data in both directions whereas, RS485 supports transmission and reception in a single direction at a time. Differential signaling is less susceptible to noise interference than single-ended signaling. RS485 uses a differential signaling method, which means that there are two signal lines between the transmitter and receiver. RS232 uses a single-ended signaling method, which means that there is only one signal line between the transmitter and receiver. These differences are explained in detail below. (very short distance) 1 Mbps 10 Mbps Difference between RS232 VS RS485

cable length) 20 Kbps 10 Kbps Maximum Data rate possible Parameter/Feature RS232 RS485 Line configuration Single-ended Differential Mode of operation Simplex or full-duplex Simplex or half-duplex Type of Connection Point-to-Point Multi-point No.of Devices Possible to Connect 1 32 Signaling Unbalanced Balanced Direction Bi-directional Uni-directional Wiring Straight-through Connections Cross-over Connections Maximum Cable Length 50 feet 4000 feet Maximum Data rate

The differences between RS232 and RS485 are consolidated in the table below. RS485 and RS432 differ in the following aspects: Let us do a comparison for both standards. RS485 was introduced with several enhanced features compared to that RS232. Thus it was not necessary to use different cable and connector models. An advantage of RS485 was that it supports the same DB9 cable and connectors used by RS232. Hence RS485 was designed to solve or improve several limitations and features of RS232.

Rs 232 connector