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44210/49210-0798 <90-00025>

 P

AGE

 5

RS-422 and RS-485 Receivers/Drivers

The RS-422 and RS-485 interfaces are differential receivers and
drivers. They are used when the modem is located greater
distances from the data terminal equipment. The RS-422 and
RS-485 interfaces do not use the RTS handshaking lines. When
using the RS-485 interface, only a TXD receiver and RXD driver
is available. When the TXD receiver recognizes a driver from the
terminal equipment, DTR is activated on the modem. When a
carrier is detected on the facility side, the CD signal on the
modem enables the RXD driver. Using this interface (RS-485)
requires only two pairs of wires for TXD and RXD, and no wires
are required for DTR and CD. The circuit board has two strap-
ping points to force RTS and DTR to the active (ON) state if
these handshaking lines are not used by the data terminal
equipment connected to the modem. If handshaking is used, the
straps should be in the OFF position. Strapping points for
termination of the differential receivers are located on the
circuit board and must be placed in the TERM position for the
interface being used. For interfaces not being used, the termina-
tion straps must be in the OFF position. Front panel LEDs are
provided on the module to indicate RXD, TXD, CD, and DTR
activity.

MPI Inputs

Six MPI inputs directly interface the microprocessor on the
44210 using edge connector pins. When an MPI input becomes
active, the microprocessor's input goes to a low state, causing
the microprocessor to perform a dial-out. One of the MPI inputs
(pin 22) is TTL/CMOS-compatible and is activated by grounding
(ground to 1.5 VDC) and inactive when left open (3.0 to 5.0
VDC). The other five MPI inputs (pins 46, 48, 52, 54, and 56) are
ground activated (ground to -2.0 VDC) and inactive when left
open or at minus battery voltage (-21 to -56 VDC).

Modem and Controller

This circuit converts data to tones and tones to data between the
line-side facility (tones) and the data terminal equipment (DTE).
The controller contains a full Hayes

tm

-compatible command set

in internal ROM and controls all of the modem's functions. The
modem has PSK and FSK modulators and demodulators for both
300 and 1200 baud operation. It also contains a DTMF generator
and call-progress-mode filters. The audio output of the circuit
may be monitored by edge connector pins or front panel jacks.

Ring Detect/Line-Seize Circuit

This circuit detects ringing tones and seizes the circuit and
holds the line active for the modem and controller.

CIRCUIT DESCRIPTION

Summary of Contents for 44210

Page 1: ...nical Reference TR NWT 000870 Copyright 1998 by Dantel Inc Dantel is a registered trademark of Dantel Inc ISO 9001 Registered Printed in the U S A INSTALLATION OPERATION MANUAL 44210 49210 0798 90 000...

Page 2: ...ly provides an interface to two telephone lines a primary and a backup The 44210 is a plug in module that fits into any 400 type or similiar equipment housing The front panel has status indicat ing LE...

Page 3: ...44 LINE SELECT 2 RING TIP TIP RING 2 WIRE LINE 1 2 WIRE LINE 1 TO RJ11 TO RJ11 41 42 23 24 50 AUDIO MONITOR 40 OFF HOOK 21 TO 56 VDC GND RCVRs TTL Interface DRVRs RCVRs RS 232 Interface DRVRs RCVRs R...

Page 4: ...tile memory for the microprocessor programming Address Latch and Decoder The address latch and decoder reads the address switch setting and programs the microprocessor to recognize that address The la...

Page 5: ...ermina tion straps must be in the OFF position Front panel LEDs are provided on the module to indicate RXD TXD CD and DTR activity MPI Inputs Six MPI inputs directly interface the microprocessor on th...

Page 6: ...ut remains at a high 5 VDC logic state Line Select Inputs The line select inputs control the line switching relay When the line select input for line 1 is grounded with input 2 open or at a high logic...

Page 7: ...DTE for commu nication with a remote DTE s modem 460 ACS Master and Remote Modes Refer to Fig 2 One 46020 Multiple Alarm Processor MAP is equipped with 46800 58 firmware and is communicating through a...

Page 8: ...tem refer to the 46800 58 MAP Firm ware Manual HayesTM Mode Refer to Fig 3 When the option switches and straps are set appropriately the 44210 may be used as a HayesTM type compat ible modem for trans...

Page 9: ...eration Refer to Installation section Subassembly The 44210 accepts a plug in subassembly the 49210 Two Line Interface Subassembly It provides an additional backup line so system data may still be tra...

Page 10: ...ront panel plug of the 44210 is removable to allow the subassembly front panel to appear in the front panel cutout The optional 49210 subassembly replaces a subassembly bypass card that is plugged int...

Page 11: ...r operation by the computer or DTE that is interfaced to the 44210 modem The front panel LEDs of the 49210 should be monitored as well Refer to Table C for front panel LED operat ing information TABLE...

Page 12: ...ide 300 Baud on DTE side 1 Stop Bit 2 Stop Bits 8 bit Word Length 7 bit Word Length Even Parity Odd Parity Reserved No Parity Auto Answer Mode 460 Remote Mode 460 ACS REMOTE MODE AUTO ANSWER MODE OR H...

Page 13: ...SEMBLY 1 5 P6 P4 1 5 1 5 ON EXT DTR ON EXT RTS GND TERM 422DTR 422TXD 485TXD 1 OFF 2 S1 S1 S1 1 2 3 4 OFF ON 5 6 7 8 BOTTOM VIEW OF MODULE 8 1 OFF S1 1 2 3 4 OFF ON 5 6 7 8 SWITCH S1 1 THROUGH S1 8 PO...

Page 14: ...TCH SETTINGS 460 ACS AUTO ANSWER MODE INSTALLATION S1 1 2 3 4 OFF ON 5 6 7 8 SWITCH S1 1 THROUGH S1 8 POSITIONS AS SHOWN BOTTOM VIEW OF MODULE S1 1 2 3 4 OFF ON 5 6 7 8 SWITCH S1 1 THROUGH S1 8 POSITI...

Page 15: ...NENT SIDE OF PC BOARD MPI MPI MPI Audio Monitor MPI MPI Line Select 1 Line Select 2 2 Wire Line 1 2 Wire Line 1 Off Hook Ring Detect 1 Ring Detect 2 21 to 56 VDC DTR TTL RTS TTL RXD TTL TXD TTL MPO TT...

Page 16: ...mmand is not followed by a carriage return Dial Precedes the phone number that is to be dialed The last digit of the phone number is followed by a carriage return Pulse Causes a pulse to be sent Touch...

Page 17: ...esult code CONNECT 1200 enabled Enables dial tone detection Enables busy signal detection Enables both dial tone and busy signal detection Long space disconnect disabled Long space disconnect enabled...

Page 18: ...s register Option register Flag register Test modes DEFAULT 0 0 43 13 CR 10 LF 8 BS 2 30 2 6 7 70 50 none none none 0 The 44210 has front panel LEDs that indicate TD Transmit Data DTR Data Terminal Re...

Page 19: ...a DTR handshaking signal from the DTE side Flashes when the module is receiving tones from a data source on the line side Comes ON when carrier tones are detected from a data source on the line side C...

Page 20: ...ufacturer s authorized agent 5 When the installation of this device requires connection or changes to the internal wiring of registered telephones or other registered devices such changes and connecti...

Page 21: ...2 MPO OUTPUTS RS 232 pin 16 TTL CMOS pin 27 WEIGHT 44210 only 44210 w 49210 Subassembly PHYSICAL MEASUREMENTS With or without 49210 Subassembly Operating Temperature Range VALUE 21 to 56 VDC 152mA max...

Page 22: ...tten instrument signed by a duly authorized officer of the Seller and accepted by the Buyer Warranty and remedies on products not manufactured by the Seller are in accordance with warranty of the resp...

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