Table of Contents
Advertisement
Section 3
COMMUNICATING WITH THE SERIES 1000
COMMUNICATION PORTS
The GASBOY Series 1000 has two asynchronous communication ports (Port 1 and Port 2) for
connecting with a data terminal and/or computer. The connection can be made by a direct cable,
via a short haul modem, or via a telephone modem. An optional auxiliary port PCB is also
available. It contains two additional ports and is used for connecting to a tank monitoring system
and/or a receipt printer.
Ports 1 and 2 of the MPU PCB can be set to the following baud rates: 300, 600, 1200, 2400, 4800,
or 9600. The auxiliary ports can be set to 300, 1200, or 9600 baud depending on the equipment
being connected (the receipt printer requires 9600 baud; the tank monitoring system can be set for
300, 1200, or 9600). When sending data to the Series 1000 system from a computer or tank
monitoring system, do not exceed 1200 baud because data may be lost when sent at higher rates.
Port 1 is normally used for direct connection of a data terminal located at the site. This port
allows access to the system's Direct Printout Mode and Command Mode. See System
Modes in Section 4 for explanations of these modes. See Appendix B for information on
installation and setup of data terminals.
Port 2 is commonly used to connect to a remote data terminal or computer. Port 2 allows
access only to the Command Mode.
The auxiliary port PCB is used to connect to a receipt printer and/or tank monitoring system.
If you ordered your system with a receipt printer and/or tank monitoring system, these ports
are already present. No additional wiring is required for the receipt printer. See the Series
1000 Installation Manual for installation wiring for a tank monitoring system.
Each port can be set individually for either RS-232 or RS-422 communications.
communication allows for the direct connection to RS-232 devices (e.g. data terminal, computer,
phone modem). The cable length is limited to 100 feet.
RS-422 communications allow for a cable length of up to 1500 feet. A GASBOY Short Haul
Modem, part number C05618, is needed to convert the RS-422 signal to RS-232 for the
connection of RS-232 devices. See the GASBOY Series 1000 Installation Manual for more detail
on RS-232 and RS-422 wiring.
COMMUNICATION PROTOCOL
Devices that communicate with the Series 1000 must be able to transmit and receive full duplex,
ASCII asynchronous data via an EIA-RS-232 connection.
The Series 1000 uses a simple terminal protocol; no special characters are transmitted to
designate the beginning or end of the data blocks. Data is transmitted in serial bit format per
character as follows: one start bit, eight data bits, one stop bit.
Each character is echoed back to the transmitting device. This checks the integrity and enables
CRT operators to display transmitted data.
05/29/03
RS-232
3-1
Advertisement
Table of Contents
