Models 375 (Including Series One), 375/1, 375/2 & 375/4 Section 4
Ludlum Measurements, Inc. Page 4-3 May 2017
BYTE1 0 x
BYTE2 x x
BYTE3 x OR x
BYTE4 x x
BYTE5 . .
BYTE6 x 0
BYTE7 Audio Status =1=on
BYTE8 High Alarm Status =1=on
BYTE9 Low Alarm Status =1=on
BYTE10 Over Range Status=1=on
BYTE11 Monitor Status =1=on
BYTE12 Error Code
BYTE13 Carriage Return (ODH)
BYTE14 Line Feed (0AH)
The RS-232 data includes the
current radiation readings and the
current condition of the status
lights. The data is presented in the
following format:
RS-232 Output
With the CAL MODE dipswitch in the left position, the Model 375 dumps RS-
232 data onto pin 4 of the 9-pin connector every two seconds.
9-Pin Remote Data Connector
(female sockets)
The 9-pin connector provides output signals from the instrument and
input voltage to the instrument. The pin assignments are:
pin1- +BATTERY
pin2- GND IN
pin3- FAIL_L
pin4- RS232 DUMP
pin5- ANALOG OUT
pin6- CHASSIS GND
pin7- HIGH ALARM_L
pin8- EXT RESET_L
pin9- +5VDC OUT
The FAIL and HIGH ALARM digital signal outputs are open drain 2N7002
outputs, able to sink about 50 mA each.
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