1450 First Ave.
Page 11 of 12
Chippewa Falls, WI 54729
(800) 283-1141 or (715) 723-1141
Fax: (715) 723-7890
DTA4000 User Manual
Pacer Instruments, Inc
Rev 1.0
www.pacer-instruments.com
11-Aug-2007
Phone: 1-800-283-1141
APPENDIX F – DATA COMMUNICATIONS
The instrument provides an RS-232 data output. The voltage levels are plus and minus 9V. A
voltage of +9V represents a space (logical “0”). A voltage of -9V represents a mark (logical “1”).
The protocol is: 1 start bit, 7 data bits, 1 odd parity bit, 1 stop bit, ASCII data format, 1200 baud.
Sample data items:
001 76.9 dgF 2385 FPM
002 24.9 dgC 12.12 MPS
RS-232 Data Pin-out Connections:
Signal 4P-Female 9-pin Printer
Gnd 1 5 7
Transmit - TXD 2 2 2
Clear/send-CTS 3 7 5
Ready/send-RTS 4 8 4
After pressing the “DUMP” key an RTS (1) appears on the RS-232 cable. The PC or printer must
respond with a CTS (0) within 1 second; if not, an “E-04” shows and DUMP mode ends. If hand-
shaking occurs, ASCII data transfers at 1200 baud. Each data line (record) is terminated with a
CR (carriage return) and LF (line feed). At the end of transmission the instrument generates an
EOF (end of file) character. The PC can then return to the OS.
APPENDIX G – ANALOG OUTPUTS
TEMPERATURE:
Range: -148º to 572ºF (-100º to 300ºC)
Scale: 360ºF/V (200ºC/V)
Offset: -0.4111V for ºF; -0.5V for ºC
Example: For Vout = 1V:
ºF temp is: (1-0.4111)V x 360ºF/V = 212ºF
ºC temp is: (1-0.5)V x 200ºC/V =100ºC
AIR VELOCITY:
Range: 0 to 7935 FPM (0 to 40.31 MPS)
Scale: 3967.5FPM/V (20.155 MPS/V)
Example: For Vout = 1V:
Velocity in FPM: 1V x 3967.5FPM/V =3967.5FPM
Velocity in MPS: 1V x 20.155MPS/V =20.155MPS
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