AMETEK 1746 LDT Interface Card - Manual (Page 13)

9 Installation & Programming Manual
Chapter 3: Set-Up & Programming
I nch/mm Bit
When the Inch/mm bit is cleared, the position and velocity data is in inches. When this bit is set,
the units of measurement are in millimeters.
Command 1: Configuration
Command 1 is used to configure the system for the type of LDTs and inputs. The 1746 LDT
Interface Module can support 5 different types of LDTs:
 Control Pulse
 Start/Stop
 Variable Pulse
 Variable Pulse Internal
Any other configuration numbers will generate an error. The default configuration is zero.
This command also configures the two inputs. They can be programmed to be either movement
detection or position hold. Input 1 is dedicated to LDT 1 and input 2 is dedicated to LDT 2.
The parameters for this command have been defined below:
Parameter 1 is a password to verify that this change is to take place. The password is 1111.
This is to prevent an accidental change in the system. Parameter 2 contains the LDT type num-
ber for LDT 1:
NOTE: The Variable Pulse with external interrogation mode is not compatible with the 952
probe. When using a 952 probe, select a different mode of operation.
Output Image Table Description
Word 0 Bit Register
Word 1 Command Register (1)
Word 2 Parameter 1 Password (1111)
Word 3 Parameter 2 LDT 1 Type
Word 4 Parameter 3 Input 1 Type
Word 5 Parameter 4 LDT 2 Type
Word 6 Parameter 5 Input 2 Type
Word 7 Parameter 6 Reserved
LDT Type Number Description
0 No LDT
1 Control Pulse
2 Start/Stop
3 Variable Pulse
4 Variable Pulse Internal
5 Pro-Stik