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MSS User Guide 4: Configuration
4-10
TXDrive
The MSS-VIA can be configured to always drive the TX (transmit) signal, or tri-state
(transmit, receive, or ignore) when not actively transmitting. The Change RS485 TXDrive
command takes one of two parameters. The Always parameter sets the MSS for
continuous TXDrive, both high and low. The Automatic parameter sets the MSS for
TXDrive only when transmitting.
Figure 4-27: Changing TXDrive for MSS4
Local>> CHANGE RS485 PORT 2 TXDRIVE AUTOMATIC
Figure 4-28: Changing TXDrive for MSS-VIA
Local>> CHANGE RS485 TXDRIVE AUTOMATIC
Note: You can only set TXDrive for Always when using four-wire mode. It must be set to
Automatic for two-wire mode.
Termination
RS-485 connections must be terminated properly in order to work. Termination is
necessary when using long cable runs, although only end nodes should be terminated.
Figure 4-29: Enabling RS-485 Termination for MSS4
Local> CHANGE RS485 PORT 2 TERMINATION ENABLED
Figure 4-30: Enabling RS-485 Termination for MSS-VIA
Local> CHANGE RS485 TERMINATION ENABLED
Slave devices should be set for automatic termination using the Change 485
Termination TX Auto command.
A Note About RS-422 Networking
The MSS is compatible with RS-422 networks in four-wire RS-485 mode. Connect the
MSS to a single slave device using a swapped cable, as shown below, and configure the
MSS as if you were going to use it for four-wire RS-485 networking.
- MSS User Guide 1
- Copyright & Trademark 2
- Contacts 2
- Disclaimer & Revisions 3
- Contents 4
- MSS Family Features 8
- Protocols 9
- About The Documentation 10
- MSS-VIA Installation 12
- Function 13
- Installation Procedure 14
- 3. Supply power to the MSS 15
- % ping nnn.nnn.nnn.nnn 16
- MSS-VIA Specifications 17
- MSS4 Installation 18
- MSS4 Specifications 21
- MSS100 Installation 22
- 1. Select a location 24
- 4. Supply power to the MSS 24
- MSS100 Specifications 25
- Privileged User Status 26
- IP Address Configuration 27
- Using ARP and Ping 28
- Using the Serial Console 29
- Incoming Logins 30
- Serial Port Logins 31
- Changing the Login Password 32
- Outbound Connections 33
- Logout 33
- Overview 34
- Rebooting the MSS 34
- Protocol Configuration 35
- IPX (NetWare) Configuration 38
- LAT Configuration 40
- RS-485 Configuration 41
- Four-Wire Mode 42
- TXDrive 43
- Termination 43
- Serial Port Configuration 44
- Serial Data 45
- Flow Control 47
- Modems and Modem Signaling 47
- Logouts 49
- 802.11 Configuration 50
- Enabling 802.11 Networking 51
- 802.11 Region 51
- MAC Address 52
- Network Mode 53
- Channel 53
- Modem Cards 54
- % telnet 192.168.0.10 2005 55
- Incoming Connections 56
- Interactive Connections 57
- Session Control 58
- Status Displays 59
- Serial Tunnel 60
- TCP Configuration 61
- UDP Configuration 61
- Multihost Mode 62
- Modem Emulation Mode 63
- Modem Mode Commands 64
- Sequential Hostlist Mode 65
- COM Port Redirector 65
- Power-up Troubleshooting 66
- DHCP Troubleshooting 67
- BOOTP Troubleshooting 67
- RARP Troubleshooting 68
- TFTP Troubleshooting 68
- Technical Support 71
- Ethernet Connector 72
- MSS VIA Connectors 72
- MSS4 Connectors 73
- MSS100 Connectors 74
- Modem Wiring 75
- Obtaining Software 76
- Reloading Software 76
- Area to Check 78
- Compliance Information 80
- Warranty 81
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