Omron E5CN-HT Communications Manual page 20

SECTION 1 Communications Methods
Host
RS-232C: 25-pin
SD (TXD) 2
RD (RXD)
3
RS (RTS) 4
CS (CTS) 5
6
DR (DSR)
SG 7
ER (DTR) 20
1
FG
1-6
This section explains how to set the E5CN/AN/EN-HT's communications
specifications. For details on the host, refer to the User's Manual provided with
the host.
RS-232C
A 1:1 connection is used. The maximum cable length is 15 m.
Use AWG24 (cross-sectional area: 0.205 mm
2
area: 2.081 mm ) shielded twisted-pair cable.
E5@N-HT
RS-232C
No.
11 SD
12 RD
13 SG
Cable Diagram
RS-422 (E5AN/EN-HT Only)
• Connections are 1:1 or 1:N. With 1:N, a maximum of 32 nodes including the
host can be connected.
• The maximum total cable length is 500 m.
• Use shielded twisted-pair cable (AWG28 min.).
• Connect a terminator at each end of the transmission path. In the following
example, connect a terminator to the host and to Unit #30 and not to any of
the other Units (#0 to #29).
• Use terminators with a resistance of 240 Ω (1/2 W). (The combined resistance
at both ends must be 100 Ω min.)
2
) to AWG14 (cross-sectional
Host (IBM PC/AT compatible)
RS-232C: 9-pin
RD (RXD) 2
SD (TXD) 3
ER (DTR)
4
SG
5
6
DR (DSR)
RS (RTS) 7
8
CS(CTS)
Cross-sectional area of
conductor
2
AWG24: 0.205 mm
AWG14: 2.081 mm 2
E5@N-HT
RS-232C
No.
11 SD
12
RD
13 SG