User`s manual

116
Chapter 5 Remote Interface Reference
3488 Mode Commands
5
The polarity parameter is a decimal weighted sum of up to seven bits and
is defined below.
Note If the slot parameter is 0, the mode parameter will be ignored. The
polarity of the built-in DIO Port 090 is specified. In this case, the EI
parameter is used to enable/disable the external Trig In/Out lines.
The EI parameter provides a method of sequencing through a scan list
without system computer intervention. EI is enabled when set to 1 and
disabled when set to 0.
The EI parameter is only applicable for the 4-bit built-in DIO and the
44474A plug-in module. For other DIO modules, EI is ignored.
When slot is set to 0, the EXT TRIG IN & OUT lines on the Mini_DIN
connector (shown on page 7) will be enabled when EI = 1. Using the
external increment/external triggering for a scan list is described in more
detail beginning on page 82.
You can send DMODE <slot> with no parameters and the 3499A/B/C
will respond with a display of the currently set parameters (i.e., mode,
polarity, EI).
Whenever power on or reset the instrument, the DIO modules are put in
Static Mode #1, with High True Logic on all lines, EI/CC are disabled.
OUTPUT 715; “DMODE 5,1,0,1”
! Set the EI & CC Mode and
STATIC Mode #1.
Definition Bit # Value
Default, data lines high true (open), PCTL
and PFLG low means ready, I/O Direction line
high for ready.
0 = Default
1st 8-bit port polarity 0 1 = Low means positive, High means negative
2nd 8-bit port polarity 1 2 = Low means positive, High means negative
PCTL Polarity 2 4 = Low means busy, High means ready
PFLG Polarity 3 8 = Low means busy, High means ready
I/O Direction line polarity 4 16 = Low means input, High means output
3rd 8-bit port polarity 5 32 = Low means positive, High means negative
4th 8-bit port polarity 6 64 = Low means positive, High means negative