ASis LX2 card is capable of driving two motorised axis, is now available with a special build of MS2000 firmware. This allow the LX2 card to be operated in standalone configuration without any additional electronics to support it. LX2 will also support the same serial commands as MS2000 controller.
|Digital Servo Loop Time||250 microsec × number of axes|
|Digital-Closed-Loop Speed Dynamic Range||> 40 dB|
|Motor Type||Brushed DC Servo Motors|
|Maximum Motor Current||1 Amp|
|Motor Voltage||6-24 V|
|Encoder Options||Internal Rotary or External Linear Encoders are supported|
|Number of Axes||Up to two Motor Axes|
|Computer Interface||RS232 Serial|
|Interface Baud Rate||115200|
|Electrical Requirements from External Power Supply Voltage|
|24V DC Current (max)||1 Amp|
|5V DC Current (max)||200 ma|
The LX2 card needs 24V and 5V to operate. Their Pinout on the two connectors are as follows.
Above is an example of the voltage rails behavior in an ASI system. 5V is derived from 24V rails , and so the 5V rails doesn't decay until 24V rails decays to 5V. In our system , this gives us about 300-360millisec delay between the two rails.
LX2 initiates shutdown task when 24V rails reaches 17Volts. Micro-controller runs off the 5V rail, there is a 1000uF Cap and diode on board the LX2 to slow down the decay of 5V rail for as long as possible.
The 16th pin of the SV3 connector is attached to the RESET line of the MicroController. Its an Active-low, so the pin is being pulled up to 5V with a 2.7K resistor. Shorting the pin to ground will reset the controller.
The LX2 communicates with a PC or other devices thru the front DB9 connector, over a RS232 protocol. A null modem cable is required. Apart from the drivers PC needs to support the RS232 interface, no special drivers are required. LX2 will readily work with ASI Console or other serial terminal programs like Termite.
|Baud rate||fixed at 115200 bps|
There are two options for mounting the LX2 in your system. First is thru the 4 mounting holes shown in the image below.
Another method is to mount the card to a panel thru the holes on the DB9 and DB25 connector . Dimensions shown in image below.
|Signal Name||DB-25 Male|
|X Mot -||1|
|X Mot +||14|
|X + 5 Volts G||15|
|X Enc Ch A||3|
|X Enc Ch B||16|
|X Left Limit||22|
|X Right Limit||10|
|X 2nd Gnd||23|
|X 2nd + 5 Volts||11|
|Y Mot -||4|
|Y Mot +||17|
|Y + 5 Volts||18|
|Y Enc Ch B||19|
|Y Enc Ch A||6|
|Y Left Limit||12|
|Y Right Limit||24|
|Y 2nd Gnd||25|
|Y 2nd + 5 Volts||13|