doc: update README.devices (USB detection, enable serial comm)

Slightly rephrase README.devices since there is no strict distinction
into "fully automatic" and "always manual". Some drivers _accept_ conn=
specs when provided, _and_ support automatic detection of enumerable
devices, _and_ might implement defaults but also support overrides.

Nit, numerically sort the list of Uni-T cables (which is about to grow
in the future) for improved readability.

Add two more devices which require users to manually enable the serial
communication (Brymen BM257s, EEVBlog 121GW).

diff --git a/README.devices b/README.devices
index 795ebc135eea3b634bb31b7f57c30a88f7438360..01baf4da79901b6d1031955d4f1e18617a7beca0 100644 (file)
--- a/README.devices
+++ b/README.devices
@@ -141,7 +141,8 @@ Example:
  $ sigrok-cli --driver <somedriver>:conn=/dev/ttyUSB0 ...
 
 The following drivers/devices require a serial port specification. Some of
-the drivers implement a default for the connection.
+the drivers implement a default for the connection. Some of the drivers
+can auto-detect USB connected devices.
 
  - agilent-dmm
  - appa-55ii
@@ -199,6 +200,7 @@ The following drivers/devices accept network communication parameters:
 
  - hameg-hmo
  - rigol-ds
+ - scpi-dmm
  - siglent-sds
  - yokogawa-dlm
 
@@ -285,9 +287,9 @@ UNI-T DMM (and rebranded models) cables
 UNI-T multimeters (and rebranded devices, e.g. some Voltcraft models) can
 ship with different PC connectivity cables:
 
+ - UT-D02 (RS232 cable)
  - UT-D04 (USB/HID cable with Hoitek HE2325U chip, USB VID/PID 04fa:2490)
  - UT-D04 (USB/HID cable with WCH CH9325 chip, USB VID/PID 1a86:e008)
- - UT-D02 (RS232 cable)
 
 The above cables are all physically compatible (same IR connector shape)
 with all/most currently known UNI-T multimeters. For example, you can
@@ -362,7 +364,9 @@ a short list for convenience:
 
  - BBC Goertz Metrawatt M2110: Briefly press the "Start/Reset" button on the
    interface panel on top.
+ - Brymen BM257s: Press HOLD during power-on.
  - Digitek DT4000ZC: Briefly press the "RS232" button.
+ - EEVBlog 121GW: Hold "1ms PEAK" until the "BT" indicator is shown.
  - Gossen Metrawatt Metrahit 1x/2x devices, driver gmc-mh-1x-2x-rs232:
    - Power on the device with the "DATA" button pressed.
    - Metrahit 2x devices must be configured for the respective interface type.