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Section 3 Specifications
3-7 Communication Unit/Board Specifications
3-7-1 RS-232C/RS-485 general purpose communication board (NA3LA-RS1)
(1) Specifications
Item
Interface
Synchronization method
Transmission speed
Transmission distance
No. of connectable units
Connection method
Transmission code
Hardware
Error control
Software
Bit send sequence
Data length which can be
transmitted or received at one
time (viewed from the PLC)
Internal current consumption
Occupied words
*2 Screw tightening torque for mounting the board on a main unit: 0.2 N·m
(2) Names
RS-485 transmission status indication LED
RS-485 terminal block
RS-485 terminating resistor switch
* Inside the surface cover
<RS-232C connector pin arrangement>
Inch screw
5
9
6
1
* For the detailed specifications of and how to use the RS-232C/RS-485 general purpose communication board (Type:
NA3LA-RS1), refer to the user's manual "General Purpose Communication (FEH528)."
Specification
RS-232C 1 channel (PORT1)
Start-stop synchronous transmission
1200/2400/4800/9600/19200/38400/57600/115200
Max. 15m
1:1
D-sub, 9-pin connector (female)
Binary (without code conversion) or
ASCII (with code conversion), EBCDIC (with code conversion)
Vertical parity (parity bit), framing, overrun error
Horizontal parity (BCC)
From the lower-order bit (from LSB to MSB)
Max. 512 bytes (Depending on the mode)
5V DC, 55mA
0 word
TX
RX
PORT2
Pin No. Signal name Description
1
–
Not connected
2
TXD
Send data
3
RXD
Receive data
4
–
Not connected
5
SG
Signal ground
6
–
Not connected
7
CTS
Clear to send
8
RTS
Request to send
9
–
Not connected
RS-485 1 channel (PORT2)
Max. 1km (19200bps or less)
1:15 (Max.)
3-pole European-style terminal block
TX
RX
RS-232C connector
PORT1
<RS-485 terminal block arrangement>
+
-
G
3-25
Signal
Description
name
+ (D+)
RS-485 send/receive +
- (D-)
RS-485 send/receive -
G (SG)
Signal ground
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