3-25
Section 3 Specications
3-7 Communication Unit/Board Specications
3-7-1 RS-232C/RS-485 general purpose communication board (NA3LA-RS1)
(1) Specications
Item Specication
Interface RS-232C 1 channel (PORT1) RS-485 1 channel (PORT2)
Synchronization method Start-stop synchronous transmission
Transmission speed 1200/2400/4800/9600/19200/38400/57600/115200
Transmission distance Max. 15m Max. 1km (19200bps or less)
No. of connectable units 1:1 1:15 (Max.)
Connection method D-sub, 9-pin connector (female) 3-pole European-style terminal block
Transmission code
Binary (without code conversion) or
ASCII (with code conversion), EBCDIC (with code conversion)
Error control
Hardware Vertical parity (parity bit), framing, overrun error
Software Horizontal parity (BCC)
Bit send sequence From the lower-order bit (from LSB to MSB)
Data length which can be
transmitted or received at one
time (viewed from the PLC)
Max. 512 bytes (Depending on the mode)
Internal current consumption 5V DC, 55mA
Occupied words 0 word
* For the detailed specications 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).”
<RS-232C connector pin arrangement>
PORT2
TX
RX
PORT1
TX
RX
RS-232C connector
RS-485 transmission status indication LED
RS-485 terminal block
RS-485 terminating resistor switch
* Inside the surface cover
<RS-485 terminal block arrangement>
5
1
+
-
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
Signal
name
Description
+ (D+) RS-485 send/receive +
- (D-) RS-485 send/receive -
G (SG) Signal ground
*2 Screw tightening torque for mounting the board on a main unit: 0.2 N·m
(2) Names
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