Seametrics iMAG, Instructions Manual

Page: 15 / 20

Page 13
INPUTS/OUTPUTS and OPERATION
Power
Source
Options
Installed
OID
Codes
Cable Conductor Usage
Red Black Green White Orange Blue
AC
One Pulse, HART APHX Do Not Connect Do Not Connect Pulse + Pulse - 4-20mA Out + 4-20mA Out -
DC
One Pulse, HART DPHX DC PWR + DC PWR - Pulse + Pulse - 4-20mA Out + 4-20mA Out -
DC
One Pulse, 4-20mA Output DPLX DC PWR + DC PWR - Pulse + Pulse - 4-20mA Out + 4-20mA Out -
DC
Two Digital Outputs DDDX DC PWR + DC PWR - Out 1 + Out 1 - Out 2 + Out 2 -
DC
4-20mA Output 1 Digital Output DDLX DC PWR + DC PWR - Out 1 + Out 1 - 4-20mA Out + 4-20mA Out -
DC
RS-485 Serial Comm DSSX DC PWR + DC PWR - RTS Signal Ground B A
DC
One Pulse Output DPXX DC PWR + DC PWR - Pulse + Pulse - Do Not Connect Do Not Connect
AC
One Pulse, 4-20mA Output APLX Do Not Connect Do Not Connect Pulse + Pulse - 4-20mA Out + 4-20mA Out -
AC
Two Digital Outputs ADDX Do Not Connect Do Not Connect Out 1 + Out 1 - Out 2 + Out 2 -
AC
4-20mA Output 1 Digital Output ADLX Do Not Connect Do Not Connect Out 1 + Out 1 - 4-20mA Out + 4-20mA Out -
AC
RS-485 Serial Comm ASSX Do Not Connect Do Not Connect RTS Signal Ground B A
AC
One Pulse Output APXX Do Not Connect Do Not Connect Pulse + Pulse - Do Not Connect Do Not Connect
Battery
One Pulse Output BPXX Do Not Connect Do Not Connect Pulse + Pulse - Do Not Connect Do Not Connect
Control Cable Wiring
Digital Output Connection. When the second or third OID code
character is “D”, refer to “ Digital Output Application” diagrams on
page 12 for recommended connections to external equipment.
These outputs are electrically similiar to the Pulse Output described
above except they are capable of output frequencies up to 10kHz.
Frequency output scaling is user-settable via the FOUT tab on the
meter’s setup menus. Selections are: 500Hz and 1, 2, 5 and 10
KHz at maximum flow rate.
Serial Communication Connection. When the second and third
OID code characters are “SS”, refer to “Control Cable Wiring” table
below for recommended connections to external equipment. These
connections provide a half-duplex, isolated, RS485 serial
communications port using the Modbus messaging protocol.
The port is reconfigurable by internal jumper settings to
full-duplex RS232 or 3.3V CMOS. The TXD connection
is the transmitted data output from the meter and RXD
is the received data input to the meter. See Seametric’s
Modbus Interface Description, LT-103393 (available at www.
seametrics.com) for supported Modbus message protocol
and electrical interface specifications.
Cable Shield. In general, the cable shield and its bare drain
wire should be left unconnected at the user equipment end
of the cable to minimize “ground loop” problems.
FOUT (Hz)
Size 500 1K 2K 5K 10K
3” 41.55125 83.10249 166.205 415.5125 831.0249
4” 23.3463 46.69261 93.38521 233.463 466.9261
6” 10.37703 20.75406 41.50813 103.7703 207.5406
8” 5.836576 11.67315 23.3463 58.36576 116.7315
10” 3.735525 7.47105 14.9421 37.35525 74.7105
12” 2.594034 5.188067 10.37613 25.94034 51.88067
K-factors for High Speed Digital Output (High Frequency)