Communicating with the series 1000 – Gasboy 1000 Series FMS Operation Manual User Manual
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05/29/03
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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.
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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.
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Port 2 is commonly used to connect to a remote data terminal or computer. Port 2 allows
access only to the Command Mode.
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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. RS-232
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.