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Garmin 188 NMEA COM2 Port?

Old 10-16-2005, 02:30 PM
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Default Garmin 188 NMEA COM2 Port?

Just to confirm, does anyone know of any restrictions on the "COM2" port of a GPSMAP 188? I want to plug in an autopilot and drive the NMEA interface from the second COM port (so I can leave COM1 configured for PC upload/download and not have to switch it around). The manual specifically talks about NMEA sonars and DGPS beacon receivers and shows COM1 as the "autopilot" port. Will the 188 output the steering sentences on COM2 if it's configured for NMEA in/out?

Second, what color is the stupid COM2 NMEA output signal wire? In the "Connecting the Power/Data" paragraph, appendix G the schematic of the connector shows COM2 TX on Pin 14 and GREEN. The picture right next to it shows COM2 TX as WHITE. Those same pictures are correct for COM1. What's up with this? Thanks!
Old 10-16-2005, 06:08 PM
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Default Re: Garmin 188 NMEA COM2 Port?

The "wire type" in the manual refers to the output/input from the device NOT the 188 as indicated by the directional arrows.

NMEA TX+ is NMEA out from the device, which is input to the 188 and in the case of COM2 is the White wire. NMEA RX+ receive to the device is output on the 188 Green wire. For COM1 NMEA TX+ (output from the device) is received by the 188 on the brown (NMEA IN). The main difference is the NMEA TX/RX on the left hand picture refers to the connected devices where as the plug diag is referring to the 188 connections proper.

COM2 NMEA output from the 188 is GREEN to NMEA RX+ on the device. There are no problems with those diagrams.

Can't see there would be a problem driving the pilot from Com2?

Cheers, Kerry.
Old 10-16-2005, 07:07 PM
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Default Re: Garmin 188 NMEA COM2 Port?

Good catch. Thanks. My hardcopy manual is a Rev A edition and it does not have any arrows on the referenced schematic. The version on the Garmin support site does have the directional arrows. I missed them until I zoomed in on the PDF page.
Old 10-16-2005, 11:40 PM
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Default Re: Garmin 188 NMEA COM2 Port?

I have a 182 which is hooked to both a 320 FF and a VHF. I also upload and download to PC, which only involves changing the Serial Data Format under the COMM menu to "Garmin Data Transfer" for computer work, then change it back to NMEA in/out; takes about 3 key strokes.
Old 10-17-2005, 08:52 PM
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Default Re: Garmin 188 NMEA COM2 Port?

Curmudgeon - 10/17/2005 12:40 AM

I have a 182 which is hooked to both a 320 FF and a VHF. I also upload and download to PC, which only involves changing the Serial Data Format under the COMM menu to "Garmin Data Transfer" for computer work, then change it back to NMEA in/out; takes about 3 key strokes.
Yeah, I know and I use Mapsource to save my WP and RTE's as well as create new routes, and have the USB chip burner for the Bluechart cards that I burn (for both the 176C on the motorcycle and the 188 on the Mako) but it sort of annoys me to have a couple of unused wires sitting there on the boat and having to reprogram the 188 when I'm on shore (shore power + PC interface) to make COM1 switch back and forth. This is just a winter project annoyance question :-). Thanks for the reply!

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