5.52 Instrument address for optional serial communications
Display: Addr
Range: 0 to 31
Default Value: 0
Set unit address for polled (POLL) or M.buS mode (0 to 31)) - seen only with serial output
option. Refer to the separate “PM4 Panel Meter Optional Output Addendum” booklet supplied
when optional outputs are fitted. Allows several units to operate on the same RS485 interface
reporting on different areas etc. if RS485 is available. The host computer or PLC may poll each
unit in turn supplying the appropriate address. The unit address ranges from 0 to 31 (DEC) but
is offset by 32 (DEC) to avoid clashing with ASCII special function characters (such as <STX>
and <CR>). Therefore 32 (DEC) or 20 (HEX) is address 0, 42 (DEC) or 2A (HEX) is address 10.
Do not use address 0 in M.buS mode.
5.53 Serial mode for optional serial communications
Display: SERL
Range: LiuE, tARE, P.HLd, d.HLd, Hi, Lo, HiLo or dISP
Default Value: LiuE
Seen only with serial output option - applies only when O.Put function set to Cont. Refer to
rEC or REC2 or dG.OP or SERL function. The HiLo selection in this functions allows both
the peak and valley memories to be transmitted. The peak value will be transmitted followed by
a space then the valley value.
5.54 Returning to normal measure mode
When the calibration has been completed it is advisable to return the instrument to the normal
mode (where calibration functions are less likely to be tampered with). To return to normal mode,
turn off power to the instrument, wait a few seconds and then restore power.
5.55 Error messages
SPAN Err - calibration span error. Live inputs used at CAL1 and CAL2 too close in value.
Recalibrate using inputs further apart in value. If you are certain that the inputs are far enough
apart but still see the SPAN Err message then ignore the message and continue with the two
point calibration. At the end of the calibration check to see if the display calibration is correct and
if not recalibrate using the same inputs.
ZERO RNGE Err - Zero range error. Caused by an attempt to zero the display outside the
allowed range. See ZERO RNGE function.
Unstable display - if the display is not stable the usual cause is either that the input signal is
unstable or that the calibration scaling was incorrectly attempted. If the calibration scaling was
unsuccessful then uncalibrating the display at the UCAL function should return the display to
stable readings but the previous calibration scaling values will be lost. If the display is still not
stable after uncalibrating then check the input for stability and noise.
PM4IVMAN-2.4-0 39 of 56
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