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EIA-574 data terminal equipment (DTE) pinout as shown in the following table and
picture:
Pin
1
1
6
2
3
4
5
6
7
8
9
Table 3.4: RS-232 Modbus connector pinout
• Maximum cable length is 15 m (50 ft) or a length equal to a line capacitance of 2500
pF, both at the maximum standard bit rate of 20 kbps. If operating at higher bit rates
the maximum cable length drops to 3 m (10 ft) at a bit rate of 57.6 kbps.
• To assure a high degree of electromagnetic compatibility and surge protection the
RS-232 cable should shielded. The shield shall be connected to an external chassis
ground at the either or both ends, depending on the application.
• The shield must not be connected to the GND pin.
To connect the GCP-MG to a PC (Personal Computer) or any other device with data
terminal equipment (DTE) pinout you need a null-modem or cross-over cable.
Connecting Ethernet
The following table describes the 10BASE-T Ethernet RJ-45 connector pinout:
Pin
1
1
2
3
4
5
6
7
8
Table 3.5: Ethernet connector pinout
• We recommend to use Category 5 UTP network cable.
• Maximum cable length is 100 m (3000 ft).
14
Signal
Function
DCD
(unused)
RXD
Receive data
TXD
Transmit data
DTR
(unused)
GND
Signal ground
DSR
(unused)
RTS
(unused)
CTS
(unused)
RI
(unused)
Signal
Function
TX+
Non-inverting transmit signal
TX-
Inverting transmit signal
RX+
Non-inverting receive signal
Internal termination network
Internal termination network
RX-
Inverting receive signal
Internal termination network
Internal termination network
Direction
in
in
out
out
in
out
in
in
UMGCPMG-2201
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