Reset
67 43 103 01000011 C
*
Open B
*
68 44 104 01000100 D
(sets AUX Pin-1 low)
*
External Input Characteristics (cont.)
Interrupt In (CONTROL Pin
4)
Input impedance 470 ohms; active-high only; minimum
input voltage required to activate int8.0 VDC. +10
volt DC output of CONTROL Pin 1 can be used as supply
voltage for this input. (located on front panel).
Close B
69 45 105 01000101 E
(returns AUX Pin-1 high)
VMM-D1 VMM-T1
Name
Description
*
*
GATE INPUT (BNC)
Input impedance 50K ohms; source current 100 µA; active-
low or active-high selectable with FUNCTION slide-switch D;
minimum pulse width determined by period of signal applied
to Trigger Input; maximum pulse width determined by
multiple of trigger signal period; TTL compatible: minimum
high-level +2.0 VDC, maximum low-level +0.8 VDC.
*
*
*
GND (CONTROL Pin 3)
RS-232C (DB-9 female)
Baud rate 9600, 8 Data bits, 1 Stop bit, No parity, No flow
control; 6 commands available; 1 global, 8 local address
locations for commands (see "ADDRESS Select"
specification for switch settings of local address locations).
Also see page 31 for QUICK BASIC test program.
0 VDC ground reference provided for CONTROL input pins
(located on front panel).
*
*
RS232
Global Address Codes
PULSE INPUT (BNC)
Input impedance 50K ohms; source current 100 µA; active-
low or active-high selectable with FUNCTION slide-switch B;
minimum pulse width determined by applicable shutter;
maximum pulse width unlimited; TTL compatible: minimum
high-level +2.0 VDC,
maximum low-level +0.8 VDC.
Commands
Decimal HEX Octal Binary ASCII
*
*
Open
64 40 100 01000000 @
*
*
Close
65 41 101 01000001 A
*
*
*
Trigger
Pulse In (CONTROL Pin 2) Input impedance 50K ohms; active-high only; minimum
pulse width determined by applicable shutter; maximum
pulse width unlimited; TTL compatible: minimum high-level
+2.0 VDC, maximum low-level +0.8 VDC (located on front
panel).
66 42 102 01000010 B
*
*
VMM-D1 & VMM-T1 User Manual
38
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