CTEK Z4200, User Manual, Page: 22 / 63

14 November 2014
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Flow Control (DB9 Only) – Selects No flow control, Hardware Flow Control (RTS/CTS), or Software Flow Control
(XON/XOFF). If RTS/CTS is selected make sure that the cable you are using has those pins connected on both ends.
Many pre-manufactured cables either do not terminate these signals or else jumper them into a permanent True state.
Service – determines the mode of operation for the serial ports. Services may be in operation on both serial ports
simultaneously.
None - Indicates that a custom application and protocol has been implemented.
TCP PAD & UDP PAD - Selects the appropriate Packet Assembly and Disassembly Service.
PPP - Establishes a PPP connection over the RS232 link
4.2.2 Serial Communications Services
Important Note:
This section of the Z4200/Z4400 User Manual describes the administrative controls and basic operation of the
Serial Pad feature. Details of dialing and control options are further described in Ctek TechNote TN007 which is
available on the Ctek web site at www.ctekproducts.com.
TCP and UDP PAD services and Point-To-Point Protocol (PP) networking services are provided for the DB9 RS232
interface. TCP and UDP PAD services are also provided for the RS-485 serial port available on the green I/O connector.
The PAD features map serially transmitted data on to packets transmitted over the routers wireless IP connection and
performs a corresponding mapping of packet data on to the appropriate serial connection. The serial connections and
assigned PAD functions can operate simultaneously over the wireless network.
Selecting the Serial Communications Services menu item causes a specific PAD selection menu to be displayed as
shown below.
Figure 14 - Serial Communications Menu
As noted previously a TCP PAD function and a UDP PAD function is available for both the DB9 serial connection and the
RS-485 auxiliary port. The UDP PAD for both connections is identical in all respects and the TCP PAD for both
connections differs only in that the DB9 TCP PAD provides for Data Terminal Ready (DTR) call control while the AUX
TCP PAD lacks this feature since the physical connection does not support DTR. Images and description of the DB9
PADs is provided below and should also be referenced for an understanding of the RS-485 PAD features.