Specifications

QnA Series Communication Modules
49
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Serial Communication modules
AJ71QC24N, AJ71QC24N-R2, AJ71QC24N-R4
Features
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A total of two channels of RS232C, RS422 and RS422/485
communication interface ports
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Both ports can operate as linked or independently.
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Choice of Dedicated protocol mode, Non-protocol mode,
or Bi-directional protocol mode
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Entire QnA device memory area and program area can
be accessed with the dedicated protocol mode.
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User definable frame is automatically added to
transmission data.
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Up to 115.2k bps of high speed transmission.
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ASCII/Binary code selection
In most cases, ASCII code is used for communicating with
PCs, sensors, and serial printers. Included in AJ71QC24
modules, however, is the option to use binary code instead
of ASCII for communication with PCs. Since a binary code
data frame is half the size of an ASCII code data frame, data
transmission time is cut in half.
Transparency code: When binary code is used for com-
munication, a transparency code can be registered so that
binary data having the same code as a frame termination
code can be transmitted.
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Independent/Link operation
Two communication port channels can operate either
independently or linked.
Independent operation: Communication speed, data
format, and protocol can be independently assigned to
each channel for different applications.
Linked operation: In this mode, data received at Ch1 is
retransmitted from Ch2 and data received at Ch2 is
retransmitted from Ch1. This mode can be selected when
multi-drop PLC control under one PC is required.
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Specifications
Item AJ71QC24N AJ71QC24N-R2
Interface
1st ch RS232C RS232C
2nd ch RS422/485 RS232C
Dedicated protocol Half-duplex (Full/half duplex in case of using On-demand function)
Communication method Non-protocol Full/half duplex
Bi-directional protocol Full/half duple
Synchronization USART
Speed AJ71QC24N, AJ71QC24N-R2, AJ71QC24N-R4: 300 to 115,200 bps
Data format Start bit 1
Data bit 7, 8
Parity bit None, Even, Odd
Stop bit 1, 2
Dedicated protocol 1 access per END processing (can be changed by parameter setting)
Access cycle Non-protocol Upon Send request, and data receive
Bi-directional protocol
Error detection
Parity check Available for all protocols
Check sum
Available for Dedicated/Bi-directional protocols
Selected in User definable frame for Non-protocol
RS232 RS422
DTR/DSR control Yes Yes
Communication control RS/CS control Yes No
CD control Yes No
DC code control Yes Yes
EEPROM rewrite Up to 100,000 times
Distance RS232C: 15 m, RS422/485: 1200 m
5VDC consumption 0.3A 0.2A
Occupied I/O points 32
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