Configuring the 615M-1 serial client and serial server Technical Application Note Purpose This application note demonstrates how to configure the ELPRO 615M-1 Wireless Modem as a serial client and serial server for a point‑to‑point RS‑232 connection. The 615M-1 supports an RS‑232 serial client and serial server for point‑to‑point communication, and allows for point‑to‑multipoint serial communication for up to 50 devices when used with the ELPRO 605M-R1 Cellular Serial Router. NNote: This application note covers point‑to‑point connection without the use of a 605M‑R1 router. It does not describe how to provision the cellular PPP connection. For instructions on configuring that connection, see the 615M-1 quick start guide. Network example overview 615M-1 Cellular Modem and Router RS-232 cable Configuring the 615M-1 serial server Use the following procedure to configure the centrally located 615M-1 as the serial server. 1. Log onto the Web interface of the 615M-1 to be configured as the serial server. 2. On the menu, click Serial. The following illustration shows a typical serial client and serial server connection between two 615M-1 cellular modems. All cellular connections must be fixed cellular (PPP) IP addresses, and can be either public or private. When using fixed private cellular SIM cards, you need to select the “Modem-to-Modem” option on the Cell Connection/Carrier page of the 615M-1 Web interface to enable point‑to‑point and point‑to‑multipoint communications. PC running terminal software A serial client establishes a connection to the serial server on a defined port. A serial server never establishes a connection; it can only accept a connection. With this in mind, the serial server typically needs to be located at a central location if the configuration requires more than one serial client device. 3. For the Electrical Interface setting, select RS‑232. 4. Set the baud rate, data/stop bits, and parity to suit your application. The settings used in this example are 9600, 8, 1, N. PC running terminal software 615M-1 Cellular Modem and Router Cellular network RS-232 cable Serial Client and Serial Server Connection Between Two 615M-1 Cellular Modems 5. Leave the DTR setting at the default, AT&D0. This setting ignores the DTR. The DTR control is used by the client to establish a connection to the server. Because this modem is selected as a server, DTR can be left at the default setting, which ignores the DTR. 4. Set the baud rate, data/stop bits, and parity to suit your application. The settings used in this example are 9600, 8, 1, N. 5. Set the DTE as follows: 6. Under the External PAD Settings, select Server as the PAD Mode, and select TCP as the PAD Protocol. This application example demonstrates two PCs connecting their terminal sessions together. There are two types of serial communication devices, DTE and DCE. PCs are DTE devices, which means by default the DTR line (pin 4) is ON. 7. In the Incoming Friendly IP Address field, enter the cellular IP address of the remote modem (the serial client). You can find the cellular IP address of the remote modem by logging onto its Web interface and displaying the Unit Status page. • For DTE devices, select AT&D9 from the DTR drop‑down menu. The modem connects to the server when DTR is ON. When DTR is OFF, the modem does not connect or the connection will close if in session. • For DCE devices, such as other modems or ELPRO 115S modules, DTR is OFF by default. For these devices, select AT&D8 from the DTR drop‑down menu. The modem connects when DTR is OFF and disconnects when DTR is ON. 8. In the Incoming Port field, enter the TCP port to be used. Both the serial server and serial client must use the same TCP port. Port 5002 is used in this example. 9. Click Save. For more information, see the Help link on the Serial Web page. 6. Under External PAD Settings, select Client as the PAD Mode, and select TCP as the PAD Protocol. 7. In the Outgoing Port field, set the outgoing port to match the incoming port of the serial server. Both the serial server and serial client must use the same TCP port. Port 5002 is used in this example. 8. In the Remote Host IP Address field, enter the cellular IP address of the serial server. You can find cellular IP address of the serial server by logging on to its Web interface and displaying the Unit Status page. 9. For TCP Client Keep Alive, select the Enabled option. When this option is enabled, an “alive” packet is periodically sent from the client to the server in order to detect a broken connection. The modem automatically tries to re-establish the connection if necessary. Serial Server Configuration 10. Click Save. Configuring the 615M-1 serial client Use this procedure to configure the remote 615M-1 modem as the serial client that will establish the connection to the serial server. 1. Log onto the Web interface of the remote 615M-1 modem. 2. On the menu, click Serial. 3. For the Electrical Interface setting, select RS‑232. 2 Technical Application Note September 2014 www.eaton.com Pin 4 is the DTR line that is required by the client modem to establish a connection. b. After connecting the serial cables, open a terminal session on both PCs and connect to the modems. You should be able to pass serial data from one end to the other (see the following examples). Serial Client Modem Sending Data Serial Client Configuration Testing serial communication After configuring the modems, follow these steps to test serial communication. Serial Server Receiving Data 1. Verify serial communication by displaying the Unit Status page on the Web interface of each modem and confirming that the PPP status is UP. This confirms that there is a cellular connection. The PPP IP Address field shows the cellular IP address provided from the carrier. This is the IP address used on the Serial page for the Incoming Friendly IP Address and the Remote Host IP Address. PPP Information on the Unit Status Page 2. Verify that serial data can be passed between the modems: a. Use a straight-through serial cable (with minimum pins 2, 3, 4, and 5 connected) to connect the serial server and serial client modems to separate PCs running terminal software. Technical Application Note September 2014 www.eaton.com 3 Eaton’s wireless business www.eaton.com/wireless North America & Latin America 5735 W. 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