EGM-5 Operation Manual V. 1.04 96 support@ppsystems.com
Digital Connection Methods
There are two methods of connecting to the EGM-5 to view digital data:
1. PC USB port
2. Wireless (if WiFi Option is installed).
USB
A USB cable (Mini-B to Type A) can be used to connect the EGM-5 to a host device such as a PC, laptop
or tablet. This cable is supplied by PP Systems with every EGM-5. When using a terminal emulator, the
COM port settings to communicate with the EGM-5 are: 19200 baud, 8 bit, 1 stop, no parity, no flow
control.
Wireless
If WiFi option is installed, there are two additional connection methods available: First, a direct wireless
connection (up to 15m) between any wireless device (e.g., phone, tablet, or laptop) and the EGM-5 can
be made without any additional hardware or routers. Second, the EGM-5 can be connected to the
customer’s wireless router, which makes it accessible via the customer’s Local Area Network (LAN). The
customer’s network may also be configured to allow remote connections to the EGM-5 over the Internet if
firewall settings and security protocols are properly configured (see your Network Administrator). PP
Systems is not responsible for any security risks associated with modifying network or firewall settings.
Digital Communication Protocols and Software
Once a connection is made to the EGM-5 as described in the previous section, communication software
is needed to read, display, and record data. This section describes three methods for reading EGM-5
data and changing settings: the EGM-5 Command Set, for direct communication using EGM-5 ASCII
character strings; GAS Software, for a Windows based graphical user interface with graphing and
logging; and Web Pages, which are available only with the WiFi Option.
EGM-5 Command Set
When a computer is connected to the EGM-5 using a USB cable, a communication protocol and
command set comprised of ASCII characters and strings allows receipt of EGM-5 data and setting of
EGM-5 parameters. A terminal emulation program (e.g., HyperTerminal or PuTTY) is generally used for
this, but other custom software may also be used to observe and interact with the EGM-5 using these
commands.
Measured data is continuously output by the EGM-5. The time interval can be modified using the Host
Measure Interval setting (default is every 1 second). The data format is dependent on the Host Measure
Format setting. Refer to Host Measure Settings on page 46 for more information.
Sending a command
To initiate a command, the Host (e.g., a PC running HyperTerminal) sends an ASCII string in comma-
delimited format to the EGM-5. The command can be sent with or without a CRC-8 (9-bit Cyclic
Redundancy Check). If a CRC-8 is sent, a ‘C’ follows the CRC-8 value.
For example,
Host sends command without CRC-8: S,1,25<CR>
Host sends command with CRC-8: S,1,25,080C<CR>
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