Info on encoders:
The differential output encoders have two complementary wires for each channel. If one is logic high (5V), then the second output is logic low (0V). These encoders have 6 or 8 wires - depends if there is a index pulse or not. Index pulse is a one pulse per revolution ant it is usually used for homing or synchronizing more drives for one axis.. The R9xH boards do not use index pulse.
Single ended encoders have only one wire for each output. They have 4 or 5 wires (two for supply, one for A, one for B and one for I). Single encoders can be different type such as CMOS, TTL and OC (open collector). The difference is in amount of current they can sink and source - encoder output current and voltage for logic low and logic high.
The single ended CMOS can sink and source same current and voltage level is close to supply rails. They usually can sink/source in order of 10's of milliamps. They can be directly connected to R9xH
The single ended TTL can typically sink -24mA and source 4mA. The logic low is less than 0.5V and logic high is more then 2.4V. They need external pull-up resistor (about 470 ohms) for each channel for direct connection to R9xH boards. The pull-up resistor is a resistor connected between the output and +5V. In can be housed inside the DB9 connector shell.
The single ended OC can usually sink plenty of current (100mA+) but they cannot source any current. They again need pull up resistor.
Your encoders are OC (LM2901 is comparator with open collector with build in 1K pull-up) and they can be directly interfaced to R9xH board as long as the cable is very short. If you want to use long(er) encoder cable you should use board such as R516. This is a converter between CMOS/TTL/OC encoders to differential output. This R516 board should be mounted close to encoder and then you can run long cable between this board and R9xH board. With good quality shielded twisted pair cable you can run encoder cable for ten's even hundred's of meter.
Please feel free to edit and post above text on the CNCzone forum.
The delivery to Ontario is about 3-7 days by EMS or 5-10 days by Air Mail post. The shipping charges are listed at
www.rutex.com. The weight of each board is about 0.2-0.4 kg.
vh
Subject: Re: r990h
Hi Vladimir, I got some more information on the renco encoders I will be using, The details are below. To clarify for myself, how do the single ended, open emitter and differential encoders differ from one another? Is that the same as absolute and incremantal types? If you get a chance I would greatly appreciate your help.
I guess I will go through the rutex web page to purchase the drives (r990h), What is the approx.delivery time to ontario canada? I assume there are shipping costs as well as brokerage fees/taxes?
Thanks again for your assistance
K. Challenger
RM15 = 1.53 inch diameter incremental modular encoder series
D = Channels A, B and Index
3 = Performance of 0 to 200 kHz and -10 to 100 degree C operation
500 = Resolution of 500 ppr in quadrature
¼ = Hub size of ¼ inch (.2498” to .2502” tolerance)
5 = +5VDC +/- 5% @ 135mA nominal
CS = 18 inch shielded round cable with termination of 4 inch leads, strip and tinned ¼ inch
VC = Voltage Comparator output interface (LM2901 with 1K ohm pullup resistor)
0 = Ungated index (360 degrees +/- 20%)
C4 = Non through shaft snap on cover, 1.812 mounting tabs using #4-40 X ¼ hex socket cap screws for mounting the encoder
S = Special non standard cable assembly.
This part is no longer in production and can be replaced with the RM15D3-500-1/4-5-CA18-VC-0-C4, RENCO P/N 77822-043. This unit is the same as the above unit except the cable assembly is our standard 18 inch length with termination using the AMP IDC connector P/N 103971-7.