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MODEL 2000 Technical Manual
Section 6
Ludlum Measurements, Inc. Page 6-3 November 2020
RS-232 COMMANDS
The Model 2000 communicates by way of an RS-232 interface. The RS-232
port operates at: 2400 baud, 8 data bits, 1 stop bit, no parity, and hardware
(RTS/CTS) flow control.
A standard RS-232 cable with straight-through connections is required.
Pin-outs of RS-232 Connector/Cable:
Model 2000 PC (9-Pin)
2 TXD RXD 2
3 RXD TXD 3
5 GND GND 5
7 CTS RTS 7
8 RTS CTS 8
All RS-232 commands must be in UPPERCASE and terminated with either
a carriage return [13] + linefeed [10] or just a linefeed [10] character. The
instrument uses the linefeed character to determine when a valid command
has been received. The commands are as follows:
SS
Start/Stop a scaler count.
SO
Start/Stop a scaler count. When the count completes, the scaler reading is
automatically sent to the computer.
RS
Read the scaler count
RL
Read the count time left.
RM
Read count time base; returns "0" for minutes and "1" for seconds.
SC
Set count time. Count time is adjustable from 1 to 65535. The count time
pushwheels must be set to "000" for this count time to be active.
RC
Read the current count time. If the count time pushwheels are set to "000",
the PC count time is returned.