AMALGAMATED INSTRUMENT PM4-IVT, Operation And Instruction Manual, Page: 38 / 45

5.58 Output mode for optional serial communications
Display:
O.Put
Range:
dISP, Cont, POLL
,
A.buS
or
M.buS
Default Value:
Cont
Set serial interface mode - seen only with serial output option. Refer to the separate “PM4 Panel
Meter Optional Output Addendum” booklet supplied when optional outputs are fitted. Allows
user to select the serial interface operation as follows:
disP
- sends image data from the display without conversion to ASCII.
Cont
- sends 8 bit ASCII form of display data at a rate typically 90% of the sample rate.
POLL
- controlled by computer or PLC as host. Host sends command via RS232/485 and
instrument responds as requested.
A.buS
- is a special communications mode used with Windows compatible optional PC download
software. Refer to the user manual supplied with this optional software.
M.bus
- Modbus RTU protocol.
5.59 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.
5.60 Serial mode for optional serial communications
Display:
SERL
Range:
LiuE, totL, P.HLd, d.HLd, Hi, Lo, HiLo
or
both
Default Value:
LiuE
Seen only with serial output option - applies only when
O.Put
function set to
Cont
. Allows
selection of serial output retransmission mode. Select
LiuE
for rate value retransmission.
Select
totL
for total value retransmission.
Select
P.HLd
for peak hold retransmission (requires remote input to be set accordingly).
Select
d.HLd
for display hold retransmission (requires remote input to be set accordingly).
Select
Hi
for peak memory retransmission (requires remote input to be set accordingly).
Select
Lo
for valley memory retransmission (requires remote input to be set accordingly).
Select
HiLo
for peak/valley memory retransmission (requires remote input to be set accordingly).
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