Dual Line Option; Introduction; Master Board Role; Slave Board Role - Samsung ML-920 Service Manual

8. Dual Line Option

8-1 Introduction

Dual Line has two communications line ports. Each Line supports maximum 33.6kbps Modem speed. It is
designed by Master and Slave Board. Each board has its own processor, communicate with shared memory.
The below shows how to communicate each other.

8-1-1 Master Board Role

It is independent Fax Board. It scan image and print received fax image. Also
It transmit scanned image and receive image from remote fax. It supports 33.6kbps Modem .
It detects all kinds of key from keyboard. It displays current status on the LCD.
It can dial the number according to pre- programmed dial number like general
Telephone set. Also it print out various reports such as transmission and reception results.

8-1-2 Slave Board Role

This board has transmission and reception capability without scanner, printer.
This board receive all data from Master Board and send image to remote fax.
In case of receive from remote fax, it sends signal to Master Board to notify Event, then received data would
transferred to Master Board. The Master Board Received image from Slave Board and save them to User
Memory. So there should be some specification between Master Board and Slave Board.
8-2 Specification
ITEM
NetBridge Chip
Hardware CPU
Flash Memory
DRAM
Modem
Shared memory
Communication mode
Max. modem speed
Coding
Dimension(HxWxD)
Power Consumption
Samsung Electronics
Description
Samsung NETBRIDGE
32bit RISC Processor, KS32C65100, 30MHz
1 Mbyte
2 Mbyte
FM336R66719, 33.6Kbps
64Kbyte SRAM
Half-Duflex
33.6Kbps
MH, MR, MMR
15 x 130 x 90
Max. 0.8A / +5VDC
Dual Line Circuit Description
8-1