
Chapter 2 Specification of Communication port for CPU module
2 – 35
2.3 Serial communication port
2.3.1 Pin arrangement
(1) RS-232C
TX1
RX1
DR1
RS1
[1]
SG1
[4]
ER2
[5]
SD1
[6]
RD1
[7]
DR1
[8]
RS1
CD1
ER1
[2]
CD1
[3]
ER1
Microprocessor
Port 1 from the front of module (Socket side)
[1
[2
[3
[4
[5
[6
[7
8
Figure 2.33 Circuit diagram and pin numbers for Serial communication port RS-232C
Table 2.21 List of signals for Serial communication port RS-232C
Pin No. Signal Direction Meaning
abbreviation CPU Host
[1] SG1 Grand for signal
[2] CD1 Notification signal during carrier received
[3] ER1 Communication enabled signal. When this signal is high level, communication is possible.
[4] ER2 Outputs High.
[5] SD1 Data transmitted by CPU
[6] RD1 Data received by CPU
[7] DR1 Peripheral units connected signal.
When this signal is high level, indicates that dedicated peripheral are connected.
[8] RS1 Transmission request signal. When this signal is high level, indicates that the CPU can receive data.
(2) RS-422 / 485
Microprocesso
SG1
N.C.
N.C.
N.C.
TX
TX1
TXN
RXN
RX1
RX
[1]
[2]
[3]
[8]
[4]
[5]
[6]
[7]
Port from the front of module (Socket side)
[1
[2
[3
[4
[5
[6
[7
8
Figure 2.34 Circuit diagram and pin numbers for Serial communication port RS-422 / 485
Table 2.22 List of signals for Serial communication port RS-422 / 485
Pin No. Signal Direction Meaning
Abbrevi
ation
CPU Host
[1] SG Grand for signal
[2] N.C. Un used. Do not connect.
[3] N.C. Un used. Do not connect.
[4] TX CPU transmission data +
[5] TXN CPU transmission data -
[6] RXN CPU receiving data -
[7] RX CPU receiving data +
[8] N.C. Un used. Do not connect.
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