OHAUS T72XW AM, Instruction Manual

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7000 SERIES INDICATORS EN 5
1.8 Main PCB
The T72XW indicator
’s main printed circuit board (PCB) provides the analog load cell scale interface, as well as the
COM1 RS-232 serial port.
The main board also contains the power input connection, display interface, keypad interface and six position DIP
switch.
An SD memory card socket is mounted to the PCB to support the optional SD memory and bus connectors are
included for the option boards.
1.9 Scale Bases
The T72XW indicator supports analog scale bases and provides 10 volts of excitation to drive analog load cells. Up
to ten 350Ω load cells can be powered by the indicator.
A six wire load cell connection is provided with sense lines to help maintain accuracy as the load cell cable
resistance changes with temperature variations.
1.10 Options
The following options are available for the T72XW:
COM2 Serial Port
─ One RS-232/485 serial COM port
USB and DIO (relay output)
─ One USB 2.0 compliant port, hardware bridge. Acts as virtual (UCP) COM port Internal, discrete I/O
(2 inputs and 4 outputs)
─ Inputs are optically isolated solid state and switch selectable as either active or passive
─ Output relays provide one normally open contact per relay
Ethernet Port
─ One 10/100 Ethernet port with automatic link polarity detection and correction.
1.11 COM2 Serial Port
This optional port provides RS-232 and RS-485 communication at rates from 300 to 115.2k baud. The port is
bidirectional and can be configured for various functions such as demand output, continuous output, extended
continuous output, SICS host communications or ASCII command input (C, T, P, Z).
The COM2 port is galvanically isolated for both RS-232 and RS-485, to provide surge voltage protection.
The RS-485 connection can be used as an RS-422 transmit only when sending continuous output to a scoreboard
or remote display.
1.11.1 Discrete I/O
The discrete I/O interface option provides dry-contact relay outputs. The relay contacts will switch up to 30 volts DC
or 250 volts AC at 1A.
The inputs are switch selectable as either active (for simple pushbutton control) or passive (for connection to
devices that supply their own power for the inputs).
The status of Inputs and outputs can be printed out as "DIO: 01 0101". "0" means the replay does not work, "1"
means the replay is working. For printing template settings, please refer to Table 3-2.
1.11.2 USB
The USB port provided is a hardware bridge acting as a virtual COM port, and is used for conversion of serial data.
The port is bidirectional and can be configured for various functions such as demand output, continuous output,
extended continuous output, SICS host communications or ASCII command input (C, T, P, Z).
1.11.3 Ethernet
The T72XW Ethernet option provides an RJ45 jack for connection to an Ethernet network or host device. A TCP
socket connection can be made to port 1701 to transfer files or to exchange data with a PC. This port can also
operate as a print client to send data to a network printer.
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