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Calibration of U137, U235 & 237 Series Weight Indicators.
Additional serial input functions at calibration or programmable serial output sequence:
F 50 P
The indicator switches to and from transm itting the calibration sequence help text when stepping in
the calibration sequence.
F n Z (or A)
Jumps to calibration step n in the sequence. Two consecutive jumps are allowed, then it restarts.
m Z (or A)
Enters value m in the step and goes to the following or preceding step. At the programmable serial
output sequence, the values are also stored in the EEPROM.
V(86)
Enters programmable serial output sequence. Corresponds to {ZERO} and {TARE} simultaneously.
RS422. The serial input is activated by |(ASCII 124) and 1-14 and [CR] (ASCII 13). Address 1-14 in Cs04.
All inputs are deactivated by | [CR].
Note! Never communicate to other equipment with an indicator addressed and do not use the character | else.
Connectors.
J2:
Transducer connector. 9p D–sub female.
1
+SIGNAL
2
–SIGNAL
3
0VA Analog zero.
4
+SENSE
5
+EXC Excitation.
6
GND Ground/shield.
7
+5VA
8
–SENSE
9
–EXC Excitation.
J3:
U237 series. Power/interface connector. 9p D–sub male. B01910.
1
0V Return for J3:2
2
Power +V
3
0VD
4
+VB (+V after fuse)
5
TD
6
Ground/shield.
7
RD
8
CTS
9
DTR
J3:
U137 series. RS232 interface connector. 9p D–sub male. B01910. Option U23890: RS422.
1
J4:1
2
RD
3
TD
4
DTR
5
0VD, J4:2
6
RS422 Rx A. J4:3.
7
RS422 Rx B. J4:6.
8
RS422 Tx A. J4:5.
9
RS422 Tx B. J4:4.
J1:
Internal I/O connector except U2373.
1
GND
2
0VD
3
+5V
4
TARE
5
NET/GROSS
6
COUNT
7
F
8
PRINT/TEST
9
ZERO
10
(TD)
11
(DTR)
12
(RD)
13
(CTS)
14
SYNC D2
15
SYNC D1
16
SYNC CK
NOTE! The body of the transducer (load cell) must be grounded!
The input amplifier is easily destroyed, when an electrostatic discharge occurs on
an ungrounded transducer, with power on the indicator. There is a great risk,
when an unmounted load cell is tested separately, as there normally is no inter-
nal ground connection. More regarding this below under precautions.
Use shielded cable, preferably double shielded, and filter D-sub.
For non symmetric load cells, +excitation to signal voltage must be higher than
signal to –excitation! If not, change all polarities.
Excitation voltage 10V ±1%. However U2379 5V±1%.
Connect GND to metal hood of D-sub.
J3:2. 11 - 26V. opt. 29V. Always connect direct to the battery, when there is a
risk of parallel inductive loads. Ripple >0.1V
U2372. Charge battery on +V via series diode. +VB is battery voltage after the
internal fuse for e.g. printer. When 0VD is used for return, +VB is switched on/off
by the indicator. Max 0,5A, 1A intermittent.
Note! The asynchronous output pin configuration does not correspond to RS232,
but the signal level is standard. Option U1731, RS232 with 25p D-sub.
No asynchronous signals in U2373 and U2379.
Use shielded cables.
Connect GND to metal hood of D-sub.
J4 is for optional signals.
RS422 is option. Full duplex.
Use shielded cable and terminating resistors at the cable ends.
Connect GND to metal hood of D-sub.
Connect to 0VD for function. R=10k
Connect to 0VD for function. R=10k
Connect to 0VD for function. R=10k
Connect to 0VD for function. R=10k
Connect to 0VD for function. R=10k
Connect to 0VD for function. R=10k
U237, RS232 level. U137, inverted, 5V CMOS level.
U237, RS232 level. U137, inverted, 5V CMOS level.
U237, RS232 level. U137, inverted, 5V CMOS level.
U237, RS232 level. U137, inverted, 5V CMOS level.
Synchronous data 2. HCMOS level. B01900,
Synchronous data 1. HCMOS level.
Synchronous clock. HCMOS level.
Date:141027 B01950 7(10)
increases variation (slow jitter).
pp
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