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4-1SectionConnecting to the RS-232C Port at the Host
59
C200H/C1000H/C2000H CPU mounting type: 3G2A6-LK201-EV1
Setting the Rear Switches
SW1
SW2
SW3
@ Unit #, parity, and transfer code
(DIP SW1-1 to SW1-5)
Set SW1-1 to SW1-5 to OFF (0).
* Parity is fixed at Even Parity. Transfer code is
fixed at ASCII 7 data bits and 2 stop bits.
@ Communications speed (DIP SW2-1 to SW2-4)
Set these switches to 0010 to select 19,200 bps.
Set these switches to 1010 to select 9,600 bps.
(0: OFF 1: ON)
@ 1-to-1/1-to-N selection (DIP SW2-6)
Set SW2-6 to OFF (0) (1-to-N).
@ Instruction level (DIP SW2-7, SW2-8)
Set these switches to ON (1).
(Levels 1, 2, and 3 are enabled.)
@ CTS selection (DIP SW3-1 and SW3-2)
Set SW3-1 to ON (1), and SW3-2 to OFF (0).
(Set this always to 0V.)
@ Synchronization (DIP SW3-3 to SW3-6)
Set SW3-3, SW3-5, and SW3-6 to ON (1), and
SW3-4 to OFF (0). (Set these to Internal.)
Connecting to a CVM1/CV Series Host Link Unit
CVM1/CV series backplane mounted type: CV500-LK201
A CVM1/CV series host link unit (CV500-LK201) has two connectors (commu-
nication ports 1 and 2). Either of these ports can be used for connection to an
NT31/NT31C by the RS-232C method. However, since the connectors at these
ports are of different types, a cable that matches the connector must be pre-
pared.
• Communication port 1
Communication port 1 is a 25-pin connector for RS-232C use only.
• Communication port 2
Communication port 2 is a 9-pin connector which allows selection of the
RS-232C or RS-422A method. When this port is used with the RS-232C meth-
od, the I/O port selector switch on the front of the unit must be set to RS-232C
(the upper position).
CPU Bus Unit Settings
When connecting to a CVM1/CV series host link unit, set the following commu-
nication conditions for the CPU bus unit settings.
Item Setting at Host
Communications speed Set the same speed as set at the NT31/NT31C
(*1)
Transfer code ASCII, 7 data bits, 2 stop bits
Parity Even
1-to-1, 1-to-N 1-to-N
(*2)
Instruction level Level 1, 2, 3
*1 Set the host link communications speed at 9600 bps or 19200 bps with the
memory switch at the NT31/NT31C. For details, refer to Setting the Host Link
Method (page160).