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Table 3-13. EIA-232 (RS-232) Communication Module Signal Routing – Comm3, Comm4, and
Signal
RX
Lit when module (Comm3, Comm4, or Comm5) is currently receiving.
TX
Lit when module (Comm3, Comm4, or Comm5) is currently transmitting.
RTS
Lit when module (Comm3, Comm4, or Comm5) is ready to send is not active.
DTR
Lit when module (Comm3, Comm4, or Comm5) data terminal ready is active.
GND
Common.
3.3.6 EIA-422/485 (RS-422/485) Serial Communications Module
Revised February-2016
EIA-232 (RS-232) uses point-to-point asynchronous serial
communications and is commonly used to provide the physical interface
for connecting serial devices, such as gas chromatographs and radios to
the DL8000. The EIA-232 (RS-232) communication provides essential
hand-shaking lines required for radio communications, such as DTR and
RTS.
The EIA-232 (RS-232) communications includes LED indicators that
display the status of the Receive (RX), Transmit (TX), Data Terminal
Ready (DTR), and Ready To Send (RTS) control lines.
Table 3-12 defines the built-in EIA-232 (RS-232) terminals at the
Comm2 port and their function signals.
Table 3-12. Built-in EIA-232 (RS-232) Signal Routing – Comm2
Signal
RX
Lit when Comm2 is currently receiving.
TX
Lit when Comm2 is currently transmitting.
RTS
Lit when Comm2 ready to send is not active.
DTR
Lit when Comm2 data terminal ready is active.
GND
Common.
The EIA-232 (RS-232) communications module provides for EIA-232
(RS-232C) signals on the Comm3, Comm4, or Comm5 port depending
on where the module is installed. See Table 3-13.
Comm5
LED Function
EIA-422/485 (RS-422/485) communication modules meet all EIA-
422/485 (RS-422/485) specifications for differential, asynchronous
serial communication transmissions of data over distances of up to 1220
meters (4000 feet). EIA-485 (RS-485) communications are commonly
used to multi-drop units on a serial network over long distances using
inexpensive twisted-pair wiring.
EIA-422 (RS-422) drivers are designed for party-line applications
where one driver is connected to, and transmits on, a bus with up to ten
receivers. EIA-422 (RS-422) allows long distance point-to-point
communications and the drivers are designed for true multi-point
applications with up to 32 drivers and 32 receivers on a single bus.
DL8000 Preset Instruction Manual
LED Function
Modules
Terminal
1
2
3
4
5
Terminal
1
2
3
4
5
3-39
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