Note that there are two blade selections for the 2-slot blade. The first setting (B 2) is used when operating the unit stand-
alone. The second selection (B2-2) is used to synchronize two optical choppers. The master unit will act as the frequency
generator for the second and will output a ‘REF OUT’ frequency equal to the outer slot frequency. The second chopper is
set to the slave by connecting the master ‘REF OUT’ signal to the ‘EXT IN’ BNC and enabling external control. The slave
will output the displayed frequency.
The /N and /D counters cannot be used with the 2 -slot blade since they will only adjust the outer frequency. Since the
ratio is 50:1 the inner (2-slot) frequency will be adjusted minimally.
Section 9: Serial Port
The MC1000 comes standard with a RS-232 serial interface port for remote control and monitoring. The serial port can be
connected to a PC running an ASCII terminal emulator program to remotely access the MC1000 features. The MC1000 has an
interactive menu, which is accessible from the serial port to control the chopper. For experienced programmers, the chopper
serial interface may be incorporated into a user program developed on a serial port system.
9.1 Serial Port Parameters
9.2 Serial Port Pin Outs
Baud
Rate:
19,200
Data
Bits:
8
Stop
Bits:
1
Parity:
none
Handshake: none
DB9F pin
Signal
1,7,8,9 no
connect
2 TxD
(from
MC1000)
3
RxD (to MC1000)
4
connected to pin 6
5 Signal
Ground
6
connected to 4
9.3 Serial Interface Command Screen
The MC1000 will echo the following screen to the serial port. The current setting is shown in parenthesis after each
command. The user can select the various commands by typing the letter enclosed in parenthesis at the beginning of
each line and the MC1000 will prompt for the user input. Typing the RETURN key will exit the input mode without
changing the value.
MC1000 Control Software - Revision x.xx (build xxxx)
Operating Menu
(R)un motor
(on)
(E)cho
panel (off)
(B)lade (B
10)
(I)nternal frequency
(500)
(N) Harmonic Multiplier
(1)
(M) Sub-harmonic divider
(1)
(X) External Reference
(off)
(O) Reference Output
(outer)
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Doc 12536-D03 Rev D 9/19/2005
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