4-20mA – 4-20mA analog inputs
The 4-20mA option converts all 8 analog inputs into 4-20mA analog inputs. This is accomplished by installing 475Ω
precision resistors between the analog inputs and ground. When using this option the analog inputs should be
configured for 0-10V analog inputs using the AQ command (AQ n,4). The equation for calculating the current is:
I
ma
= 2.105 V
Where I
ma
= current in mA
V = Voltage reading from DMC-41x3
Part number ordering example: DMC-4113-CARD(4-20mA)
TRES – Encoder Termination Resistors
The TRES option provides termination resistors on all of the main and auxiliary encoder inputs on the DMC-41x3
motion controller. The termination resistors are 120 Ω, and are placed between the positive and negative
differential inputs on the Main A, B, Index channels as well as the Auxiliary A and B channels as in Figure A.1.
NOTE: Single ended encoders will not operate correctly with the termination resistors installed. If a combination
of differential encoder inputs with termination resistors and single ended encoders is required on the same
controller, contact Galil directly.
Part number ordering example: DMC-4113-CARD(TRES)
ISCNTL – Isolate Controller Power
The ISCNTL option isolates the power input for the controller from the power input of the amplifiers. With this
option, the power is brought in through the 2 pin Molex connector on the front face of the controller. This option
is only valid when Galil amplifiers are ordered with the DMC-41x3. Molex connector part numbers and power
connector pin-outs can be found here: Power Connector Part Numbers, pg 172
Part number ordering example: DMC-4113-BOX4(ISCNTL)-D3020
RS-422 – Auxiliary Serial Port Serial Communication
The default serial configuration for the DMC-41x3 is to have RS-232 communication on the Aux (P2) serial port.
The controller can be ordered to have RS-422 for this port. RS-422 communication is a differentially driven serial
communication protocol that should be used when long distance serial communication is required in an
application.
See the JP1 - Jumper Description for DMC-41x3 section for termination resistor options for CTS and RXD signals.
Appendices ▫ 168 DMC-41x3 User Manual
Figure A.1: Encoder Inputs with -TRES option
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