Rs 422 interface ic incremental encoder interface for rs. Common parts, reduced pin counts, smaller connectors, and fewer lines in the. The pc4 can be used with the e2, e3, h1, h3, s1 and s2 encoders. This is a differential signal and requires transmission line termination. Rs 422 in this case is just restating the balanced 5 volt output which means there are a, a, b, b, z, z outputs. Max14890e incremental encoder interface for rs422, htl, and. Mc 3486 sn 75175 am 26 ls 32 channel b channel b channel a channel a channel i channel i gnd encoder, line driver. The max14890e incremental encoder receiver contains four differential receivers and two singleended receivers. Rs 485 line drivers and receivers, exar exar has a broad range of rs 485 transceivers that are compliant to popular field bus standards, including profibus. The ssi clock input is supposed to be an optocoupler, so you may be able to connect that directly to an arduino output check whether a current limiting resistor is. There are usually three components in an optical rotary encoder. Rs422, also known as tiaeia422, is a technical standard originated by the electronic industries alliance that specifies electrical characteristics of a digital signaling circuit. Featuring an integrated encoder link function, the line drivers can be deactivated and analogdigital signals directly accessed through the line driver output pins. Line driver rs232, rs485, rs422 drivers transmitters product list at newark.
For the right application and paired with an appropriately sized pullup resistor, a 7273 line driver can be a very good solution. This allows the encoder to drive long cables up to. Rs422 systems can transmit data at rates as high as 10 mbits, or may be sent. For differential rs422 line driver operation, six differential complementary. I am purchasing an incremental encoder that has an rs 422 line driver ouput. The differential receivers can be operated in rs422 or differential highthreshold logic htl modes and are optionally configurable for singleended ttlhtl operation. Maxon sensor 366 encoder hedl 5540 ec 32, 80 w 214 78. Rs422, rs485 differential line driver texas instruments. Encoder hedl 5540, 500 cpt, 3 channels, with line driver. Rs422 line driver to ni digital input termination ni. The model 272a optoverter, 4 wire rs 422 to fiber optic line driver converter, provides the capability of extending the distance of an rs 422 network to 6600 feet. Some manufacturers say that they are 422 when really they are pointtopoint but with rs422 line drivers i.
Encoder 16 easy 1281024 cpt, 3 channels, with line driver. The rio is a highresolution optical 3channel encoder with line driver in acc. Singleended, ttlcompatible input signals are transmitted as differential, 5v rs 422 output signals at a rate up to 10mhz. Theres a pair in each direction and each end continuously drives its transmit pair. When in the on state, a line driver will supply vcc. This encoder features a 12 or bit absolute parallel gray code output, a selection line for count direction, and an output latch as standard.
Today most incremental encoders have a pushpull htl or rs422 ttl output driver. The new ichf provides 6 rs422 line driver s for 3v 5. Frequency standard frequency response is 200 khz for cpr 1 to 2540 500 khz for cpr 2541 to 5000 1 mhz for cpr 5001 to. The chip offers ttlstyle output with a fivevolt regulated output. This mode is used for fanout of a single signal to four receivers. The differential receivers can be operated in rs422 or differential highthreshold logic htl modes and are optionally configurable for singleended ttlhtl. Max14890e incremental encoder interface for rs422, htl. Each board has a 5pin socket designed to plug into the 5 pins of the encoder. Pc4 product description the pc4 is a small, plugin rs 422 cable driver board that drives long cables up to feet using differential signalling to provide improved noise immunity.
Signals can be provided in either a singleended multivoltage line driver ttl compatible when. Competitive prices from the leading line driver rs232, rs485, rs422 drivers transmitters distributor. However, i can not find much information on the electrical characteristics of the 9411. Open collector an open collector is a sinking output. Rs 422 interface ic ep dual highspeed diff line driver enlarge mfr. The eadl10 is a differential rs422 cable driver which converts the singleended abi output from usds singleended incremental encoders or any three ttl level digital signals to 3 pairs of differential signals. And as i mentioned earlier would not be able to drive the ctrio inputs directly. Rs 422 rs 485 interface ic 65v fault protected 500kpbs20mbps halfduplex rs 485 rs 422 transceivers. An optical rotary encoder is an angular position sensor. Radial or axial cable outlet, m23 or m12 male connector, axial or radial. Line driver 20 ma max per channel meets rs 422 at 5 vdc supply index once per revolution gated to channel a. Line driver rs232, rs485, rs422 drivers transmitters. Output is standard gray code with options for natural binary or ssi compatible signals. A few questions about rs422rs485 encoders decoders.
Rs422, rs485 quadruple differential line driver texas instruments these monolithic quadruple differential line drivers with 3state outputs are designed to meet the requirements of ansi standards eiatia422b and rs485 and itu recommendation v. Rs422, rs485 line driver maxim integrated rs422, rs485. Available with 7pin ms style connector without index z. A, a, b and b so it just sends to raw ticks of the encoder and not serial data i didnt have a line receiver available so a colleague thought to test we can just connect the a and b lines to a microcontroller and use those.
Because of this, a sinking input is required for proper operation. Additionally the rs422 standard allows for line impedances down to 50 ohms while supporting the high data rates. Interface to a 5v biss position encoder texas instruments. Selecting an appropriate incremental encoder line driver starts with the. To rnpico otherwise, instead of the dld 5v output configuration you could use the npn open collector 5 with appropriate pull up resistors or. It was intended to replace the older rs232c standard with a standard that offered much higher speed, better immunity from noise, and longer cable lengths. Encoder 16 easy 1281024 cpt, 3 channels, with line driver rs. Defined by the tia standard, the rs422 is a transceiver that can be used with encoders as a differential line driver. Terminal resistance r typical 100 output signal eia standard rs 422 drivers used. The connections between the ur rs 422 and the line driver are all tx to tx and rx to rx. I thought this should work as well but we are seeing weird transition in the encoder pattern that. Rs422, rs485 line driver maxim integrated the max3040max3045 is a family of 5v quad rs 485rs422 transmitters designed for digital data transmission over twistedpair balanced lines. The disconnected or disabled condition of the line driver usually is referred to as the tristate1 condition of the driver. Find rs 422 line drivers related suppliers, manufacturers, products and specifications on globalspec a trusted source of rs 422 line drivers information.
A resolution of up to 65,536 counts per turn can be programmed ex works. Industrial servo drive with biss position encoder interface. Ttl format uses rs422 signaling, making it a good fit for noisy environments. Choosing between line driver, open collector, and push. For differential rs422 line driver operation, six differential complementary drivers are implemented. On the output side of the pc4, ribbon cables can be used for lengths. To enable the differential driver to be used, the rs422 standard uses a four conductor cable. To order a dg 60 l, 5v rs 422, face mounting flange, radial cable exit, shaft 10 mm, 1024 pulses per rotation dg 60 lwkrf, 1024 type radial axial radial cable axial cable connector exit connector exit exit 1. Please refer to the table below for a simple example of a line driver. I have also had succes with both the usb and ethernet versions of nis adapters. Black box multipoint line driver ld485amp shorthaul modem rs232, rs 422, rs 485, v.
The cable strain relief and robust general design make it an excellent choice for. It appears that the encoder output is rs422, so you will need an rs422 or rs485 line driver as part of the interface. Encoder enc 16 rio, 16384 counts per turn, 3channel, with rs. With the integrated encoder link function, the line drivers can be deactivated and analogdigital signals directly accessed through the line driver output pins. Competitive prices from the leading 4drivers differential line driver rs232, rs485, rs422 drivers transmitters distributor. Today most incremental encoders have a pushpull htl or rs422 ttl output driver, these have replaced most of the older output circuits like open collector npn, open collector pnp, voltage output. How an optical rotary encoder worksoptical rotary encoders have a shaft mechanically coupled to an input driver. Pc4 product description the pc4 is a small, plugin rs422 cable driver board that drives long cables up to feet using differential signalling to provide improved noise immunity. Telebyte rs422 fiber line driver, db25f, externally powered. The longer the cable run, the higher the impedance, which degrades signal strength.
Rs 422 interface ic ep dual highspeed diff line driver. At the same time it provides the inherent advantages of fiber transmission over optic cable, immunity to interference, safety, secure communications, etc. Description similar to the tb271 series except designed for rs422 and rs485. There are many way to terminate this signal and it depends on the characteristics of the device, in this case an ni 9411 digital input. The encoder line driver utilizes an industry standard line driver ic, am26c31q, which provides complementary outputs for each encoder channel. Incremental rotary encoders generate an output signal each time the shaft. I have a encoder on a dc motor that outputs its signals as rs 422. It converts an angular displacement directly into a digital form. Thus, the output of the line driver encoder is a, a, b, b and ii for three channel versions.
953 1418 227 1326 868 627 801 522 1204 793 754 892 241 814 1146 810 831 514 965 466 1436 184 520 588 909 916 1300 1112 1324 993 1346 638 293 93 951 96 88 1070 643 214 52 1066