1
6
9
5
1
14
25
13
257
Method for Making the Cable for Connection to the Host
Appendix G
Connector Specifications and Wiring for OMRON Units
The combination of pin numbers to which the connecting wires are connected differs according to the connector
specifications for each unit. Check the connector specifications of the unit to be connected and make the wiring
connections for the items in the connection combination indicated below which are applicable.
[NT20S Connector Specifications (9-pin)]
S Electrical characteristics: Complies with EIA RS-232C
S Signal direction: Signal input and output is relative to NT20S.
Connector
Signal Direction
Pin No.
Signal Name
Abbreviation
Input Output
2 Send data SD (TXD) f
3 Receive data RD (RXD) f
4 Request to send RS (RTS) f
5 Clear to send CS (CTS) f
6 +5 V output, 150 mA max. +5V f
9 Signal ground SG – –
Correct Use: If using the +5 V supply of pin No.6, check first that the equipment that is to receive the supply has a
current capacity no greater than 150 mA. The +5 V output of the NT20S is +5 V"5%, max. 150
mA.
Connecting an NT20S to a C-Series Host Link
S C-Series Host Link Unit 25-pin Connector Specifications
Applicable Host Link Unit: C200H-LK201(-V1)
C500-LK201-V1
C500-LK203
C120-LK201-V1
S Electrical characteristics: Complies with EIA RS-232C
S Signal direction: Signal input and output is relative to the PC.
Connector
Signal Direction
Pin No.
Signal Name
Abbreviation
Input Output
1 Frame ground FG – –
2 Send data SD (TXD) f
3 Receive data RD (RXD) f
4 Request to send RS (RTS) f
5 Clear to send CS (CTS) f
7 Signal ground SG (GND) – –
14 Optical connector +5V (see note 2) +5V – –
15 Send signal element timing 2 (see note 1) ST2 f
17
Receive signal element timing
(see note 1)
RT f
20 Data terminal ready ER (DTR) f
24 Data signal element timing (see note 1) ST1 f
Note 1. No element timing signals on C200H-LK201(-V1)
2. C500-LK201 and C200H-LK201(-V1) only
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