7
1-2-2 RS-422
RS-422 lines can be used to connected up to 32 PCs to the same host computer.
Transmission Distance The maximum transmission distance varies with the method in which a host
computer and PCs are connected. There are two connection methods available:
via RS-232C wire cable and via optical fiber cable. Either method requires the
use of Link Adapters. The overall arrangement of system components is the
same regardless of whether wire or optical fiber cable is used. A system with
wire components is shown below. Refer to Appendix B Specifications for Link
Adapters specifications.
Host computer (mainframe, personal
computer, or mini-computer)
RS-232C
(15 m max.)
3G2A9-AL004-(P)E
Link Adapter
3G2A9-AL001
Link Adapter
RS-422
(trunk line)
RS-422 (trunk line)
Branch
RS-422 (10 m max.)
Branch
RS-422 (10 m max.)
CV-series PC CV-series PC CV-series PC
3G2A9-AL001
Link Adapter
RS-422 (trunk line)
RS-422 Cable The host computer can be connected to up to 32 PCs through RS-422 wire
cables. If the host computer has a RS-422 port, it can be connected directly to
the first 3G2A9-AL001 Link Adapter. If the host computer has only a RS-232C
port, use a 3G2A9-AL004-E or 3G2A9-AL004-PE Link Adapter to convert
RS-232C to RS-422 as shown above. The maximum cable lengths are as fol-
lows:
Length of RS-232C cable
15 m max.
Total length of RS-422 cable 500 m max.
Length of each RS-422 branch 10 m max.
Optical Fiber Cable The 3G2A9-AL004-E or 3G2A9-AL004-PE and 3G2A9-AL002-E or
3G2A9-AL002-PE Link Adapters can be used to connect a Host Link System
using optical fiber cables. The 3G2A9-AL004-E or 3G2A9-AL004-PE Link
Adapters are used to convert between wire and optical lines and the
3G2A9-AL002-E or 3G2A9-AL002-PE Link Adapters are used to branch optical
lines. In the diagram shown above, the AL001 Link Adapters would be replaced
System Configuration Section 1-2
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