OHAUS 7000 Series, Инструкция по эксплуатации, Страница: 104 / 134

EN 98 7000 SERIES INDICATORS
APPENDIX C COMMUNICATIONS
C.1 Serial Interface Parameters
One standard serial port and one optional serial port are supported with the T72XW terminal. They are designated
COM1 (standard port on the Main PCB) and COM2 (optional).
COM1 provides an RS-232 interface only. The RS-232 interface is a three-wire (TDX, RXD, and GND) with
selectable XON-XOFF handshaking.
Optional
COM2 provides RS-232 and RS-485 interfaces. The RS-232 interface is a three-wire (TDX, RXD, and
GND) with selectable XON-XOFF handshaking. The RS-485 connection is a two-wire interface but does not
support multi-drop communication with addressing. The port must be selected for use as either RS-232 or RS-485
due to the different operating requirements of the interfaces.
The baud rate can be configured from 300 to 115.2K baud and a checksum character can also be configured when
using one of the continuous output strings.
The T72XW terminal supports the following functions on the serial ports:

SICS (level 0 and level 1)

Reports

Variable access (COM1 only)

Continuous

The COM1 port is also used when flashing new firmware to the terminal.
Demand Output Mode
The demand output mode transmits data only when the terminal receives a print request. Print requests are sent to
the T72XW terminal when:

The operator presses PRINT

A discrete input selected as print is triggered

An ASCII “P” is sent through a demand or continuous port

Auto print is enabled and all conditions for auto print are met

A print command is sent via shared variable access
When triggered, data is transmitted in a string programmed in the output template portion of setup. Demand mode
is used typically when sending data to a printer or PC on a transactional basis.
NOTE: When the demand output mode is assigned, the port is automatically set up to also receive certain ASCII
characters to duplicate keypad functions.
Output Templates
The T72XW terminal provides three programmable output templates to define the string of data to be transmitted.
Each of the templates is configured in setup and can contain up to 25 fields of data. The same template can be
sent to both COM1 and COM2 if both ports are programmed for demand output. It is also possible to send a
different data string from the two ports by assigning a different template to each one.
The detault values for each of the templates follow:
Template 1
29.94 kg
10.32 kg T
19.62 kg N