Chapter 1 Introduction
1.7.11 FRM220-Serial/485 In-band managed RS-485/422/232 Fiber Modem
The FRM220-Serial/485 provides an Asynchronous Fiber Modem solution to extend RS-485 or RS-232
transmission distance up to 2km over multimode fiber or up to 120km over single mode fiber. The modem is
equipped with multiple interface circuits for connection to RS-232 or RS-485/422 (2 or 4 wire, full or half duplex).
The FRM220-Serial/485 secures data transmission over EMI resistant fiber at speeds up to 460kbps for RS-232 or
up to 1024kbps for RS-485/422. When the FRM220-Serial/485 card modem is placed in the FRM220 rack with
SNMP management, in-band management allows viewing the card and remote modem's status, type, version, fiber
link status, data link status and alarms. Both card and remote can
the port and set the interface type.
Features
• Extend asynchronous serial transmission from 2km to 120km over fiber
• In-band network management
• Manage via terminal, web or SNMP in FRM220-CH20 chassis
• Software selectable data interface for RS232/ 422/ 485
• Software selectable two wires (half duplex) or four wires (full duplex) RS4
• Software selectable three or five wires RS232
• Speeds up to 460kbps for RS232 (Async. mode)
• Speeds up to 1Mbps for RS485/ 422 (Async)
Specifications
Ports
Optical Interface
Connector : 1x9 (SC, ST, FC) or SFP LC
Data rate : 36.864Mbps
Line coding: Scrambled NRZ
Bit Error Rate: Less than 10
-10
Cable type : MM 62.2/125μm, 50/125μm. SM 9/125μm
Distance : MM 2km, SM 15/30/50/80/120km, WDM 20/40/60/80km
Wavelength: 1310nm, 1550nm,
Electrical Interface
Connector : 6 pins Terminal block
Data Signal Formats
RS485 2-wire
RS422 4-wire
RS232 RTS/CTS 5-wire
RS232 3-wire
Baud Rate:
RS422, RS485 up to 1024kbps
RS232 up to 256kbps
Standard EIA/TIA RS485, RS422, RS232
LEDs Power, FX Link, DI, DO, Test
Power DC In 12V
Power Consumption
< 5W
Dimension (D x W x H) mm 155 x 88 x 23mm
Weight 120g
Temperature
-10~60° C (Operating) ,-20~70° C (Storage)
Humidity 10~95% non-condensing
Certification CE LVD/EMI, FCC, RoHS
MTBF
65,000 h (25° C)
This product includes the following models:
• FRM220-Serial/485 (6 pin terminal block and fixed fiber transceiver)
• FRM220-Serial/485S (6 pin terminal block with SFP)
be configured to enable or disable the port, reset
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