CHAPTER ONE
The power supply used in this unit has an input range of 85 to 264 Volts. No
jumpering required.
B. RS-232 INPUT/OUTPUT (9 PIN D CONNECTOR J2)
This I/O port provides remote control of operating functions in an ASCII
protocol. BAUD rate, parity, word length, and stop bits are all selectable. Data is
input to this interface through the TX line and output through the RX line. Time
data can be output in either ASCII or Packed BCD formats. For operation, refer
to Chapter Three.
Table 1-1 lists the connector pin assignments.
Table 1-1
RS-232 I/O (J2)
Pin Number Designation
Pin 1 Not Used
Pin 2 RX
Pin 3 TX
Pin 4 DTR
Pin 5 Ground
Pin 6 DSR
Pin 7 RTS
Pin 8 CTS
Pin 9 Not Used
C. HIGH STABILITY EXTERNAL TIME BASE INPUT (BNC J5)
This external frequency input can be used to supply a high stability time base for
the unit. The unit will use this external input, if connected, in place of the internal
oscillator. The following Table 1-2 lists the input specifications:
Table 1-2
High Stability External Sine Wave Input (J5)
Frequency 1-10MHz.
Amplitude 1 volt peak-to-peak to 5 volts peak-
to-peak square wave.
Input Impedance
50Ω, nominal.
1-4 TM7000 TymMachine TCG/T (Rev D) Symmetricom, Inc.
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