VMM-D3/D4 Shutter Driver
20
Function
VMM
DB-9F
IBM
DB-9M
IBM
DB-25M
MAC
Mini-DIN-8F
Rx
Receive Data
2
2
3
5
Tx
Transmit Data
3
3
2
3
GND
Signal Ground
5
5
7
4
Pin-Out Comparison for Various Serial COM Ports
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 22-Pin D-Sub) male connector to the Rx pin, Pin 2 of the
VMM-D3
front panel 9-Pin
D-Sub connector for proper operation. Connect all other functions as indicated above.
By sending the proper commands, the unit will respond by activating the proper function. The
program listed on page 25 of this manual will allow operation of the
VMM-D3
from the
computer keyboard.
Up to eight
VMM-D3
units can be daisy-chained together (connected through the same serial
port) using the
910RSDC
cable. One cable is required for each controller in the chain. Figure 6
illustrates connecting two controllers from a single serial port. Once connected, each unit will
require a unique address in the chain. This is accomplished by adjusting the octal switch SW1 to
the desired command range. (See “SW1 Address Select” under GENERAL
CHARACTERISTICS in the SPECIFICATIONS section for a complete listing of the command
range for each octal switch position.) The specific command range set will decode commands
sent via the serial port. A set of “ALL” commands is also available to control all units connected
to the serial port.
The Table
below lists the DB-9 female, RS-232C connection pin-out
(VMM-D3 only).
Pin
Function
1
CD
Carrier Detect
2
Rx
Receive Data
3
Tx
Transmit Data
4
DTR
Data Terminal Ready
5
GND
Signal Ground
6
DSR
Data Set Ready
7
RTS
Request to Send
8
CTS
Clear to Send
9
RI
Ring Indicator
DB-9 Female, RS-232C Connection Pin-Out (VMM-D3 Only)
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