DC112 MODEM OPERATOR’S MANUAL REVISION: 12/91 COPYRIGHT 1987, 1989 CAMPBELL SCIENTIFIC, INC.
WARRANTY AND ASSISTANCE The DC112 MODEM is warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products.
DC112 MODEM 1. FEATURES • Bell 212A and CCITT V.22 Compatible • Full Duplex at 300 and 1200 Baud • "AT" Command Set • RJ-11C Telephone Jack • Pulse or Tone Dialing • Direct Connection to and powered by: - CSI dataloggers - CSI PC201 Card in IBM PC Compatible - Computer - CSI PC203 Power-up Control Box - CSI SC532 RS232 Interface • Signal Level Connects/Disconnects 5Vdc External Power minimizing current drain 2.
DC112 MODEM 4. INSTALLATION Your DC112 is designed to be used on standard device telephone lines. The DC112 connects to the telephone line by means of a USOC RJ11C jack. Connection to telephone companyprovided coin service (central office implemented systems) is prohibited. Connection to party lines service is subject to State tariffs. Connect the cable from the telephone jack to the modem Figure 2. Connection to the datalogger is done with a Campbell Scientific SC12 Cable.
DC112 MODEM Remote datalogger installations require a telephone surge protector (Model 2372-01) unless the telephone company confirms a surge protector has already been installed at the remote site (Figure 3). Connect the 14 awg grounding wire (provided with the DC112) to the grounding terminal (GND) on the DC112 and to the datalogger ground. If the enclosure has a grounded bus bar, then connect the ground wire to the bus bar instead of the datalogger ground.
DC112 MODEM 5. IF PROBLEMS ARISE If any of your telephone equipment is not operating properly, you should immediately remove it from your telephone line, as it may cause harm to the telephone network. If the telephone company notes a problem, they may temporarily discontinue service. When practical, they will notify you in advance of this disconnection. If advance notice is not feasible, you will be notified as soon as possible.
DC112 MODEM TABLE 1. Jumper Settings JUMPER PINS MEANING FACTORY SETTING 1. H15 2. H15 3. H15 4. H15 5. C8 1 to 8 2 to 7 3 to 6 4 to 5 1 to 2 Result Codes Enabled Auto-Answer Disabled Enable CCITT V.22 Do not use Non-datalogger Site Jumper in Place Jumper not in Place Jumper not in Place Jumper not in Place Jumper not in Place JUMPER 1 - Result codes (Appendix A) are sent to your terminal screen. JUMPER 2 - Auto answer is disabled by putting the jumper in place.
APPENDIX A. "AT" COMMAND SUMMARY This manual does not attempt to be a primer on the "AT" command set. The commands are therefore only summarized below. For most applications, the modem commands are issued automatically by the PC208 software. The commands apply only when the modem is used as an originate modem, which is not the primary use of this modem. Except as noted, all commands begin with "AT" and end with carriage return.
APPENDIX B. FCC WARNING TO USERS OF CLASS A COMPUTING DEVICES WARNING: This equipment generates, uses, and can radiate radio frequency energy, and if not installed and used in accordance with the instruction manual, may cause interference to radio communications.
