VMM-T1 User Manual
25
RS-232C Operation
The
VMM-T1
inputs can be controlled via an RS-232C computer serial signal (COM port). From the
computer’s RS-232C serial port, connect a cable such as the Model
910RS
(not supplied), the
910RSDC
(not supplied), a
null modem cable
, or a user-constructed cable (with connections as enumerated in the
INPUT SPECIFICATIONS) to the unit’s RS-232C interface.
Connect the Tx (transmit) from the host to the Rx (receive) on the
VMM-T1
control unit. All other
lines are not used except for the ground connection. If the host contains a 25-Pin D-Sub or an 8-Pin
Mini-DIN, check the computer’s user manual to find the proper corresponding pin-outs. In most cases
the corresponding 25-Pin D-Sub pin-out and MAC 8-Pin Mini-DIN are as follows:
Function
VMM
DB-9F
IBM
DB-9M
IBM
DB-25M
MAC
Mini-DIN-8F
VCM
RJ45
Rx
Receive Data
2
2
3
5
5
Tx
Transmit Data
3
3
2
3
6
GND Signal Ground
5
5
7
4
4
General Pin-Outs for 25-Pin D-Sub and MAC 8-Pin Mini-DIN
All other pins not used. Be sure to connect the Tx pin, Pin 3, from the IBM 9-Pin D-Sub (or Pin 2 from
the 25-Pin D-Sub) male connector to the Rx pin, Pin 2, of the
VMM-T1
9-pin D-SUB female connector,
located on the rear panel, for proper operation. Connect all other functions by type as indicated above.
By sending the proper commands the unit will respond by activating the proper functions.
The
RS-232C Test Program
listed elsewhere in this manual will allow operation of the VMM-T1 from
the computer keyboard.
Activation of the EXPOSURE and DELAY times with a TRIGGER command through the RS-232C
interface can be de-activated as follows:
a.
RESET command from the control unit's front panel
b.
Through the RESET INPUT BNC on the rear panel
c.
Reset command through the RS-232C
When an open command is sent to the
VMM-T1
controller, a RESET command will
not
close the
shutter. The shutter must be closed with a CLOSE command.
The
VMM-T1
controller trigger
command from the RS-232C is utilized to trigger the built in timers.
