A6175 ROC800-Series Remote Operations Controller Instruction Manual

ROC800-Series Instruction Manual

Revised Jul-14

Communications

5-13

5.9 Dial-up Modem Communication Module

The dial-up modem module interfaces to a Public-Switched Telephone

Network (PSTN) line, and requires a telephone line connection. The

module provides a telephone interface on the host port that is capable of

both answering and originating telephone calls. The module also

provides electronics that conserve power when the phone line is not in

use.

Note

When installing a dial-up modem module, you

must

remove

power from the ROC800.

The dial-up modem provides communication with speeds up to 14.4

Kbps with V.42 bis and V.42, MNP2-4 and MNP10 error correction,

and is FCC Part 68 approved for use with PSTNs. The FCC label on the

module provides the FCC registration number and the ringer equivalent.

The module supports data compression, error correction, and

nonvolatile RAM for permanent storage of the modem configuration.

Using asynchronous operation, the module interfaces to two-wire, full-

duplex telephone lines. It interfaces to a PSTN through an RJ-11 jack.

You control the modem using industry-standard AT command software.

A 40-character command line is provided for the AT command set,

which is compatible with EIA document TR302.2/88-08006.

The dial-up modem automatically hangs up after a user-configured

period of communication inactivity and provides automated dial-up

alarm reporting capabilities. Refer to the

ROCLINK 800 Configuration

Software User Manual (for ROC800-Series) (

Part Number

D301250X012

)

or the

ROCLINK 800 Configuration Software User

Manual (for ROC800L)

(Part Number D301246X012).

Table 5-12. RJ-11 Field Connections

Signal

Pin

Tip

Ring

LED indicators on the module show the status of the Receive (RX),

Transmit (TX), Ring (RI), and Carrier Detect (CD) control lines.

Table 5-14

displays connector signals and their functions.

Table 5-13. Modem Signal Routing – Comm3, Comm4, and Comm5

Signal

Function

Lit when module (Comm3, Comm4, or Comm5) is currently receiving.

Lit when module (Comm3, Comm4, or Comm5) is currently transmitting.

Lit when module (Comm3, Comm4, or Comm5) detects a ring.

Lit when module (Comm3, Comm4, or Comm5) on carrier detect.