SC105 9-Pin to RS-232-DCE Interface User Guide Issued 19.10.10 Copyright © 2004-2010 Campbell Scientific Inc. Copied under licence by Campbell Scientific Ltd.
Guarantee This equipment is guaranteed against defects in materials and workmanship. This guarantee applies for twelve months from date of delivery. We will repair or replace products which prove to be defective during the guarantee period provided they are returned to us prepaid.
PLEASE READ FIRST About this manual Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the North American market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors: Area: 1 in2 (square inch) = 645 mm2 Length: 1 in. (inch) = 25.4 mm 1 ft (foot) = 304.8 mm 1 yard = 0.914 m 1 mile = 1.609 km Mass: 1 oz. (ounce) = 28.35 g 1 lb (pound weight) = 0.454 kg Pressure: 1 psi (lb/in2) = 68.95 mb Volume: 1 UK pint = 568.
Contents PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat® bookmarks tab for links to specific sections. 1. General Description .................................................... 1 2. Specifications .............................................................. 2 3. Set-up Menu ................................................................. 3 3.1 Set-up Menu Selections ............................................................................
SC105 9-Pin to RS-232-DCE Interface Figure 1. SC105 9-Pin to RS-232-DCE Interface 1. General Description The SC105 (Figure 1) is used to interface a CSI datalogger to any modem that is configured with an RS-232 DCE (Data Communications Equipment) serial port. The SC105 is an intelligent interface that buffers data (1k buffer size), allowing many RS-232 data rates, and all CS I/O port modes. Features include: • True RS-232 signal levels.
SC105 9-Pin to RS-232-DCE Interface 2. Specifications RS-232 9-Pin Female Connector Pin-out: Pin No. 1 2 3 4 5 6 7 8 9 I/O In In Out Out In Out In In Name DCD RXD TXD DTR GND DSR RTS CTS Ring Description Data Carrier Detect (No Connection) Received Data Transmitted Data Data Terminal Ready Signal Ground Data Set Ready (No Connection) Request to Send – Modem Enable Clear to Send Rings Datalogger CS I/O 9-Pin Male Connector Pin-out: 2 Pin No.
User Guide RS-232 Baud Rates The SC105 will support the following baud rates: 1200, 9600, 19200, 38400, 57600, 115200 RS-232 Parity and Data The SC105 supports the following: Parity: Even, Odd, None Data Bits: 7, 8 CS I/O Port Modes: CSDC, SDC, ME, Addressed Print Device for P96 output Electrical The SC105 uses power from the +5 V line on the 9-pin interface connected to the datalogger. Current Standby: 0.
SC105 9-Pin to RS-232-DCE Interface SC105) while setting SC105 parameters on the RS-232 port, although CS I/O communications would be inactive until exiting the Set-up Menu. SC105 - SW Version 2.0 Main Menu: Current Configuration (1) CS I/O Port Configuration [Modem Enable] (2) RS-232 Port Configuration [9600] (3) Restore Factory Defaults (4) Save and Exit (5) Exit w/o Saving Settings (9) Help Enter Choice: Figure 2. Set-up Menu 3.
User Guide 'PC/PDA mode': DTR and RTS are both driven to 5 V. 'Modem mode': DTR will be driven to +5 V when the CS I/O interface is active for Modem Enable, SDC Address 9, and Addressed Print Device configurations. When the CS I/O is inactive, DTR will be 0 V. Additionally, there will be a 'dead time' after DTR is dropped of 2 sec when data coming in on the RS-232 will be ignored. For SDC Address 7 or 8, DTR will always be driven to +5 V.
SC105 9-Pin to RS-232-DCE Interface For transmission, the RAD modem uses a cable made of two pairs of twisted wires with a shield. Data rates up to 9600 bps are possible. The low voltage transmission levels minimize cross talk between adjacent lines within the same cable. Data are transmitted and received at a balanced impedance, providing excellent immunity to circuit noise. Table 1 gives the data rate possible for several gage cables across several distances. Table 1.
User Guide includes hardware for mounting to ground lug of CSI enclosures models ENC 10/12, ENC 12/14, or ENC 16/18). Spark gap wiring is straight through such that pin to pin continuity exists between the two modems. If the modems are installed entirely within a building, the transient spark gap protection is probably not needed. Figure 4.
SC105 9-Pin to RS-232-DCE Interface 5.3 Testing RAD Modem Communication The modem communication link is divided into the following three sections: 1) RAD modem computer end, 2) cable from computer modem to datalogger modem, 3) RAD modem datalogger end. When unable to establish communication with the datalogger, test each of the three sections.
User Guide 6. CDMA Modem Application In most modem applications the SC105 can be used with the factory defaults. This sets the SC105 up as modem enable 9600 baud, 8 data bits, Parity None and 1 stop bit. It also sets the DTR dead time to 2 seconds. This dead time is used to prevent characters produce by the modem from waking the datalogger up right after communications has been terminated. The dead time can be adjusted by changing the RS-232 DTR and RTS mode to Custom.
CAMPBELL SCIENTIFIC COMPANIES Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com • info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za • sales@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA) PO Box 444 Thuringowa Central QLD 4812 AUSTRALIA www.campbellsci.com.au • info@campbellsci.com.au Campbell Scientific do Brazil Ltda.
