User Manual

1.3 Specifications
General environment
 Operating temperature: -25°C to +75°C
 Storage temperature:-40°C to +85°C
 Humidity: 0 to 90 %
 Built-in Watch Dog Timer (1.6 seconds)
 Built-in power protection & network protection circuit
 Program downloadable from PC
 Built-in I/O expansion bus interface
1.3.1 Specifications of 7521/7521D/7522/7522D/7523/7523D
System
 Module name: Intelligent Communication Controller
 CPU: Am188™ES, 20M Hz
 SRAM: 128K bytes
 FLASH ROM: 256K bytes
 COM port: COM1, COM2, COM3, COM4
 Built-in EEPROM
 Supports I/O Expansion Bus (7521/7521D only)
 Program download port: COM1
EEPROM
 2048 bytes ( 8 blocks, each block has 256 bytes)
 Data retention > 100 years
 1,000,000 erase/write cycles
Flash Memory
 256K bytes
 Erase unit is one sector(64K bytes)
 100,000 erase/write cycles
COM1
 RS-232 or RS-485
 RS-232: TXD,RXD,RTS,CTS,GND
 RS-485: D1+, D1-, self-tuner ASIC inside
 Communication speed: 115200 max.
7521/2/2A/3/4/7 Series Hardware User’s Manual, Ver. 1.5 Sep/2002, 7Mh-001-15 -----23