Newport New Focus Picomotor 8743-CL, User Manual

Page: 101 / 133

101
PH?
Description
Hardware status query.
Syntax
PH?
Remarks
This command is used to query general hardware status for all the axes. This function allows
the user to observe the various digital input signals as they appear to the controller in real-time.
Note that the positioner’s Home or Index signals come in on the same controller differential
input pair, feedback connector pins 14 & 15. That means that if an 8410 rotary positioner is
connected then the Home/Index input actually represents ‘Index’ signal status, because that is
what the 8410 provides. However, if an 8310-V actuator is connected then the Home/Index
represents ‘Home’ signal status, because that is what the 8310-V provides.
Note that the Index signal is a momentary signal transition, a few encoder counts wide, whereas
a Home signal is typically a logical High from the middle of positioner travel range to the
positive travel limit and a logical Low from the negative travel limit to the positioner middle.
The controller treats the signal differently, as either Home or Index type, depending on whether
the OR (Find Home) or MZ (Find Index) command was issued.
Response Value Description
nn
Integer Decimal representation of binary number
Bit Value Definition
0 0
1
Axis 1 positive hardware travel limit low
Axis 1 positive hardware travel limit high
1 0
1
Axis 1 negative hardware travel limit low
Axis 1 negative hardware travel limit high
2 0
1
Axis 1 home/index signal low
Axis 1 home/index signal high
3 0
1
Axis 2 positive hardware travel limit low
Axis 2 positive hardware travel limit high
4 0
1
Axis 2 negative hardware travel limit low
Axis 2 negative hardware travel limit high
5 0
1
Axis 2 home/index signal low
Axis 2 home/index signal high
Example
PH? (Get hardware status)
9 (Returns 9. 9 decimal is equal to 1001 in binary. This means bits 0 and 3 are
logical HIGH which also means positive hardware travel limits on axes 1 and 2
are TTL level HIGH)
See Also
MT, MZ