TM 5-3895-374-24-1
APPENDIX 1
Serial Output Port Set-Up -
Printer/Setpoint Data Comm./ Remote
Display.
The DF2000 Serial Output Port can be set up for the following functions:
1)
Operate a printer for weight/total print-out.
2)
Provide a setpoint signal to control material feed.
3)
Interface with a computer for two-way communication.
To set up the Port. go to Calibration Mode and select Parameters 31 and 32,
e.g.
To enter Calibration Mode -->
press (1) (9) (SELECT) and press
’Calibrate’ button at
back of indicator.
(Flashing ’]’ indicates
Calibration Mode.)
Go to Parameter 31 Serial Port Speed --> press [3] [1] [SELECT].
If you are using the port for a printer or for data
communications, set the appropriate Baud Rate:
1 = 9600 Baud
2 = 1200 Baud (Factory Preset Setting)
3 = 300 Baud
e.g. To set the Port Speed to 300 Baud --> press [3] [ENTER]
(Remember the [TARE] key is the [ENTER] key while you are in the Calibration
Mode.)
Go to Parameter 32 Serial Port Mode --> press [3] [2] (SELECT).
Set the operating mode from the following list
1 = Output only when (PRINT] button is pressed.
2 = Output when Strobe - 1.
3 = Output when Strobe = 0.
4 = Output when ASCII “?" or other poll character is received. (Factory Preset)
5 = Continuous output.
6 = Setpoint Mode.
7 = RD2000 (To operate a remote display)
e.g. To operate a Printer --> press [1] (ENTER).
(Remember the [TARE] key is the [ENTER] key while you are in the Calibration
Mode.)
e.g. To operate the port as a setpoint control --) press [6]
Note:
Make sure that you have wired the port correctly. See Section II
Installation for a description of the signal pins.
Serial Output Format
TTL Polarity is the same as RS232 standard, but voltage levels are 0 VDC
and +5 VDC. The output is Idle at 0 VDC and active at +5 VDC.
Data Word Configuration:
1 Start Bit
7 Data Bits
1 Parity (held zero)
1 Stop Bit
The port accepts five possible ASCII poll characters in Mode 4. The polls
are.
? - Send current displayed weight.
1 - Set to Channel 1 and send displayed weight.
2 - Set to Channel 2 and send displayed weight.
3 - Set to Channel 3 and send displayed weight.
T - Set to Total and send displayed weight.
The serial output is organized as follows (node 4)
Byte
0
“02" (Start of Text)
1
Polarity (Space or -)
2
Space
3
Data
MSD )
4
Data
)
5
Data
)
6
Data
)Weight
including decimal point.
7
Data
)
8
Data
LSD )
9
Space
10
K or L
11
G or B
12
Channel Information*
13
G or N
14
R or T
15
Space
16
Status (Space = valid Weight, 0 = Over,
M = Motion, - = Minus)
17
Carriage Return
18
Line Feed
(page 3-72)
